init/do_mounts: initrd_load() can be boolean

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

No functional change.

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>

init/do_mounts.h

@@ -57,11 +57,11 @@ static inline int rd_load_image(char *from) { return 0; }
 
 #ifdef CONFIG_BLK_DEV_INITRD
 
-int __init initrd_load(void);
+bool __init initrd_load(void);
 
 #else
 
-static inline int initrd_load(void) { return 0; }
+static inline bool initrd_load(void) { return false; }
 
 #endif