kernel: mips_disable_fpu: initialize fault_addr in fpu_emulator_cop1Handler

kernel: mips_disable_fpu: initialize fault_addr in fpu_emulator_cop1Handler

Code calling fpu_emulator_cop1Handler will pass on fault_addr, making gcc
complain about it not being initialized when the FPU emulator is disabled.

Fixes:

arch/mips/kernel/traps.c: In function 'do_fpe':
arch/mips/kernel/traps.c:864:22: error: 'fault_addr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  process_fpemu_return(sig, fault_addr, fcr31);
                      ^
arch/mips/kernel/traps.c: In function 'do_ri':
arch/mips/kernel/traps.c:806:22: error: 'fault_addr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  process_fpemu_return(sig, fault_addr, fcr31);
                      ^
arch/mips/kernel/traps.c:763:15: note: 'fault_addr' was declared here
  void __user *fault_addr;
               ^
arch/mips/kernel/traps.c: In function 'do_cpu':
arch/mips/kernel/traps.c:1421:28: error: 'fault_addr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
   if (!process_fpemu_return(sig, fault_addr, fcr31) && !err)
                            ^
cc1: all warnings being treated as errors
make[7]: *** [arch/mips/kernel/traps.o] Error 1

Signed-off-by: Jonas Gorski <jogo@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46184 3c298f89-4303-0410-b956-a3cf2f4a3e73