m32r: fix pull clearing RESTORE_SIGMASK into block_sigmask() fallout

Commit a610d6e6 ("pull clearing RESTORE_SIGMASK into
block_sigmask()") caused:

  arch/m32r/kernel/signal.c: In function 'handle_signal':
  arch/m32r/kernel/signal.c:289:6: warning: 'return' with a value, in function returning void [enabled by default]

Remove the return value it forgot to remove.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>