Coccinelle emits this warning:

  WARNING: casting value returned by memory allocation function to (struct proc_inode *) is useless.

Remove unnecessary cast.

Link: http://lkml.kernel.org/r/1487745720-16967-1-git-send-email-me@tobin.ccSigned-off-by: NTobin C. Harding <me@tobin.cc>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>