MIPS: sysmips: Use unreachable().

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c
index 201cb76..8c81f7d 100644
--- a/arch/mips/kernel/syscall.c
+++ b/arch/mips/kernel/syscall.c
@@ -235,7 +235,7 @@
 	: "r" (regs));
 
 	/* unreached.  Honestly.  */
-	while (1);
+	unreachable();
 }
 
 save_static_function(sys_sysmips);