Now that sparse looks into asms, fix the fake anti-optimizer cast

macro to use the right address space.

include/asm-i386/uaccess.h

@@ -314,7 +314,7 @@ do {									\
 
 #endif
 struct __large_struct { unsigned long buf[100]; };
-#define __m(x) (*(struct __large_struct *)(x))
+#define __m(x) (*(struct __large_struct __user *)(x))
 
 /*
  * Tell gcc we read from memory instead of writing: this is because