kernel/trace_probe: is_good_name can be boolean

This patch makes is_good_name return bool to improve readability
due to this particular function only using either one or zero as its
return value.

No functional change.

Link: http://lkml.kernel.org/r/1442929393-4753-2-git-send-email-bywxiaobai@163.comSigned-off-by: NYaowei Bai <bywxiaobai@163.com>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>

kernel/trace/trace_probe.h

@@ -302,15 +302,15 @@ static nokprobe_inline void call_fetch(struct fetch_param *fprm,
 }
 
 /* Check the name is good for event/group/fields */
-static inline int is_good_name(const char *name)
+static inline bool is_good_name(const char *name)
 {
 	if (!isalpha(*name) && *name != '_')
-		return 0;
+		return false;
 	while (*++name != '\0') {
 		if (!isalpha(*name) && !isdigit(*name) && *name != '_')
-			return 0;
+			return false;
 	}
-	return 1;
+	return true;
 }
 
 static inline struct event_file_link *