kmemleak: Disable early logging when kmemleak is off by default

Commit b6693005 (kmemleak: When the early log buffer is exceeded, report
the actual number) deferred the disabling of the early logging to
kmemleak_init(). However, when CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=y, the
early logging was no longer disabled causing __init kmemleak functions
to be called even after the kernel freed the init memory. This patch
disables the early logging during kmemleak_init() if kmemleak is left
disabled.
Reported-by: NDirk Gouders <gouders@et.bocholt.fh-gelsenkirchen.de>
Tested-by: NDirk Gouders <gouders@et.bocholt.fh-gelsenkirchen.de>
Tested-by: NJosh Boyer <jwboyer@gmail.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

mm/kmemleak.c

@@ -1757,6 +1757,7 @@ void __init kmemleak_init(void)
 
 #ifdef CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF
 	if (!kmemleak_skip_disable) {
+		atomic_set(&kmemleak_early_log, 0);
 		kmemleak_disable();
 		return;
 	}