MIPS: signal: Remove unreachable code from force_fcr31_sig().

Based on discussion with Linus remove the impossible to reach code
rather than replacing it with a BUG().

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Link: http://lkml.kernel.org/r/20170718140651.15973-4-ebiederm@xmission.com