signal/mips: Remove FPE_FIXME usage from mips

Ralf Baechle recently merged a change to stop explicitly handling this
case on mips, as the case is impossible.  Unfortunately when the code
in force_fcr31_sig to not use siginfo but a simple interger variable gcc
starts warning about an unitialized variable.

So add a return statement so gcc knows the code never attempts to use
the impossible value.

Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: N"Eric W. Biederman" <ebiederm@xmission.com>

arch/mips/include/uapi/asm/siginfo.h

@@ -123,11 +123,4 @@ typedef struct siginfo {
 #define SI_TIMER	-3	/* sent by timer expiration */
 #define SI_MESGQ	-4	/* sent by real time mesq state change */
 
-/*
- * SIGFPE si_codes
- */
-#ifdef __KERNEL__
-#define FPE_FIXME	0	/* Broken dup of SI_USER */
-#endif /* __KERNEL__ */
-
 #endif /* _UAPI_ASM_SIGINFO_H */

arch/mips/kernel/traps.c

@@ -735,7 +735,7 @@ void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
 	else if (fcr31 & FPU_CSR_INE_X)
 		si.si_code = FPE_FLTRES;
 	else
-		si.si_code = FPE_FIXME;
+		return; /* Broken hardware? */
 	force_sig_info(SIGFPE, &si, tsk);
 }