slab: convert slab_is_available() to boolean

A good candidate to return a boolean result.

Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
Cc: Christoph Lameter <cl@linux.com>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 5ce4fae..113a6fd 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -692,7 +692,7 @@
 }
 EXPORT_SYMBOL(kmem_cache_shrink);
 
-int slab_is_available(void)
+bool slab_is_available(void)
 {
 	return slab_state >= UP;
 }