[ARM] Kill gcc preprocessor warning.

arch/arm/boot/compressed/head-sa1100.S

@@ -34,7 +34,7 @@ __SA1100_start:
 		@ REVISIT_PFS168: Temporary until firmware updated to use assigned machine number
 		mov	r7, #MACH_TYPE_PFS168
 #endif
-#ifdef CONFIG_SA1100_SIMPAD /
+#ifdef CONFIG_SA1100_SIMPAD
 		@ UNTIL we've something like an open bootldr
 		mov	r7, #MACH_TYPE_SIMPAD @should be 87
 #endif