The seq_file conversion of /proc/pid/maps caused altered behaviour with
respect to 2.4.22.  Before the conversion, spaces and tabs in filenames were
displayed verbatim.  After the conversion they are escaped as \040, etc.

Also, if the mmapped file has been unlinked the output appears as

40017000-40018000 rw-p 00000000 03:02 1425800    /home/akpm/foo\040(deleted)

instead of

40017000-40018000 rw-p 00000000 03:02 1425800    /home/akpm/foo (deleted)

This could break applications which parse /proc/pid/maps (one person has
reported this).

The patch restores the 2.4.20 behaviour.