s390/uaccess: add default cases for __put_user_fn()/__get_user_fn()

Add default cases for __put_user_fn()/__get_user_fn(). This doesn't
fix anything since the functions are only called with sane values.

However we get rid of smatch warnings:
./arch/s390/include/asm/uaccess.h:143 __get_user_fn() error: uninitialized symbol 'rc'.
Signed-off-by: NHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: NVasily Gorbik <gor@linux.ibm.com>

arch/s390/include/asm/uaccess.h

@@ -60,6 +60,9 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n);
 #define INLINE_COPY_TO_USER
 #endif
 
+int __put_user_bad(void) __attribute__((noreturn));
+int __get_user_bad(void) __attribute__((noreturn));
+
 #ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
 
 #define __put_get_user_asm(to, from, size, spec)		\
@@ -109,6 +112,9 @@ static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned lon
 					(unsigned long *)x,
 					size, spec);
 		break;
+	default:
+		__put_user_bad();
+		break;
 	}
 	return rc;
 }
@@ -139,6 +145,9 @@ static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsign
 					(unsigned long __user *)ptr,
 					size, spec);
 		break;
+	default:
+		__get_user_bad();
+		break;
 	}
 	return rc;
 }
@@ -190,8 +199,6 @@ static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long s
 })
 
 
-int __put_user_bad(void) __attribute__((noreturn));
-
 #define __get_user(x, ptr)					\
 ({								\
 	int __gu_err = -EFAULT;					\
@@ -238,8 +245,6 @@ int __put_user_bad(void) __attribute__((noreturn));
 	__get_user(x, ptr);					\
 })
 
-int __get_user_bad(void) __attribute__((noreturn));
-
 unsigned long __must_check
 raw_copy_in_user(void __user *to, const void __user *from, unsigned long n);