fault-inject: make enum fault_flags available unconditionally

This will allow using should_fail_ex from code without having to
make it conditional on CONFIG_FAULT_INJECTION.

Signed-off-by: Christoph Hellwig <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Vlastimil Babka <[e-mail]>

include/linux/fault-inject.h

···
 struct dentry;
 struct kmem_cache;
 
+enum fault_flags {
+	FAULT_NOWARN =	1 << 0,
+};
+
 #ifdef CONFIG_FAULT_INJECTION
 
 #include <linux/atomic.h>
···
 	unsigned long count;
 	struct ratelimit_state ratelimit_state;
 	struct dentry *dname;
-};
-
-enum fault_flags {
-	FAULT_NOWARN =	1 << 0,
 };
 
 #define FAULT_ATTR_INITIALIZER {					\