kernel/module: module_is_live can be boolean

Make module_is_live return bool due to this particular function only using
either one or zero as its return value.

No functional change.

Link: http://lkml.kernel.org/r/1513266622-15860-6-git-send-email-baiyaowei@cmss.chinamobile.com
Signed-off-by: Yaowei Bai <baiyaowei@cmss.chinamobile.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/module.h

@@ -491,7 +491,7 @@ extern struct mutex module_mutex;
 /* FIXME: It'd be nice to isolate modules during init, too, so they
    aren't used before they (may) fail.  But presently too much code
    (IDE & SCSI) require entry into the module during init.*/
-static inline int module_is_live(struct module *mod)
+static inline bool module_is_live(struct module *mod)
 {
 	return mod->state != MODULE_STATE_GOING;
 }