mips: switch to generic compat rt_sigpending()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/mips/kernel/scall64-o32.S

@@ -388,7 +388,7 @@ sys_call_table:
 	PTR	sys32_rt_sigreturn
 	PTR	sys_32_rt_sigaction
 	PTR	compat_sys_rt_sigprocmask 	/* 4195 */
-	PTR	sys_32_rt_sigpending
+	PTR	compat_sys_rt_sigpending
 	PTR	compat_sys_rt_sigtimedwait
 	PTR	sys_32_rt_sigqueueinfo
 	PTR	compat_sys_rt_sigsuspend