Check for snd_soc_ops structures that are only stored in the ops field of a
snd_soc_dai_link structure.  This field is declared const, so snd_soc_ops
structures that have this property can be declared as const also.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct snd_soc_ops i@p = { ... };

@ok1@
identifier r.i;
struct snd_soc_dai_link e;
position p;
@@
e.ops = &i@p;

@ok2@
identifier r.i, e;
position p;
@@
struct snd_soc_dai_link e[] = { ..., { .ops = &i@p, }, ..., };

@bad@
position p != {r.p,ok1.p,ok2.p};
identifier r.i;
struct snd_soc_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct snd_soc_ops i = { ... };
// </smpl>

The effect on the layout of the .o files is shown by the following output
of the size command, first before then after the transformation:

   text    data     bss     dec     hex filename
   4500     696       0    5196    144c sound/soc/generic/simple-card.o
   4564     632       0    5196    144c sound/soc/generic/simple-card.o

   text    data     bss     dec     hex filename
   3018     608       0    3626     e2a sound/soc/generic/simple-scu-card.o
   3074     544       0    3618     e22 sound/soc/generic/simple-scu-card.o

   text    data     bss     dec     hex filename
   4148    2448     768    7364    1cc4 sound/soc/intel/boards/bdw-rt5677.o
   4212    2384     768    7364    1cc4 sound/soc/intel/boards/bdw-rt5677.o

   text    data     bss     dec     hex filename
   5403    4628     384   10415    28af sound/soc/intel/boards/bxt_da7219_max98357a.o
   5531    4516     384   10431    28bf sound/soc/intel/boards/bxt_da7219_max98357a.o

   text    data     bss     dec     hex filename
   5275    4496     384   10155    27ab sound/soc/intel/boards/bxt_rt298.o
   5403    4368     384   10155    27ab sound/soc/intel/boards/bxt_rt298.o

   text    data     bss     dec     hex filename
  10017    2344      48   12409    3079 sound/soc/intel/boards/bytcr_rt5640.o
  10145    2232      48   12425    3089 sound/soc/intel/boards/bytcr_rt5640.o

   text    data     bss     dec     hex filename
   3719    2356       0    6075    17bb sound/soc/intel/boards/bytcr_rt5651.o
   3847    2244       0    6091    17cb sound/soc/intel/boards/bytcr_rt5651.o

   text    data     bss     dec     hex filename
   3598    2392       0    5990    1766 sound/soc/intel/boards/cht_bsw_max98090_ti.o
   3726    2280       0    6006    1776 sound/soc/intel/boards/cht_bsw_max98090_ti.o

   text    data     bss     dec     hex filename
   5343    3624      16    8983    2317 sound/soc/intel/boards/cht_bsw_rt5645.o
   5471    3496      16    8983    2317 sound/soc/intel/boards/cht_bsw_rt5645.o

   text    data     bss     dec     hex filename
   4662    2592     384    7638    1dd6 sound/soc/intel/boards/cht_bsw_rt5672.o
   4790    2464     384    7638    1dd6 sound/soc/intel/boards/cht_bsw_rt5672.o

   text    data     bss     dec     hex filename
   1595    2528       0    4123    101b sound/soc/intel/boards/haswell.o
   1659    2472       0    4131    1023 sound/soc/intel/boards/haswell.o

   text    data     bss     dec     hex filename
   6272    4760     416   11448    2cb8 sound/soc/intel/boards/skl_nau88l25_max98357a.o
   6464    4568     416   11448    2cb8 sound/soc/intel/boards/skl_nau88l25_max98357a.o

   text    data     bss     dec     hex filename
   7075    4888     416   12379    305b sound/soc/intel/boards/skl_nau88l25_ssm4567.o
   7267    4696     416   12379    305b sound/soc/intel/boards/skl_nau88l25_ssm4567.o

   text    data     bss     dec     hex filename
   5659    4496     384   10539    292b sound/soc/intel/boards/skl_rt286.o
   5787    4368     384   10539    292b sound/soc/intel/boards/skl_rt286.o

   text    data     bss     dec     hex filename
   1721    2048       0    3769     eb9 sound/soc/kirkwood/armada-370-db.o
   1769    1976       0    3745     ea1 sound/soc/kirkwood/armada-370-db.o

   text    data     bss     dec     hex filename
   1363    1792       0    3155     c53 sound/soc/mxs/mxs-sgtl5000.o
   1427    1728       0    3155     c53 sound/soc/mxs/mxs-sgtl5000.o
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Mark Brown <broonie@kernel.org>