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
   5027    2488     416    7931    1efb sound/soc/rockchip/rk3399_gru_sound.o
   5219    2312     416    7947    1f0b sound/soc/rockchip/rk3399_gru_sound.o

   text    data     bss     dec     hex filename
   3499    1648     384    5531    159b sound/soc/rockchip/rockchip_max98090.o
   3563    1584     384    5531    159b sound/soc/rockchip/rockchip_max98090.o

   text    data     bss     dec     hex filename
   3455    1536     384    5375    14ff sound/soc/rockchip/rockchip_rt5645.o
   3519    1480     384    5383    1507 sound/soc/rockchip/rockchip_rt5645.o
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Mark Brown <broonie@kernel.org>