ipc/mqueue.c: fix a brace coding style issue

Signed-off-by: somala swaraj <somalaswaraj@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200301135530.18340-1-somalaswaraj@gmail.com


Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>