include/linux/slab.h: fix a typo error in comment

fix a typo error in slab.h
"allocagtor" -> "allocator"
Signed-off-by: tangjianqiang <tangjianqiang@xiaomi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Souptick Joarder <jrdr.linux@gmail.com>
Link: https://lkml.kernel.org/r/1600230053-24303-1-git-send-email-tangjianqiang@xiaomi.comSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/slab.h

@@ -279,7 +279,7 @@ static inline void __check_heap_object(const void *ptr, unsigned long n,
 #define KMALLOC_MAX_SIZE	(1UL << KMALLOC_SHIFT_MAX)
 /* Maximum size for which we actually use a slab cache */
 #define KMALLOC_MAX_CACHE_SIZE	(1UL << KMALLOC_SHIFT_HIGH)
-/* Maximum order allocatable via the slab allocagtor */
+/* Maximum order allocatable via the slab allocator */
 #define KMALLOC_MAX_ORDER	(KMALLOC_SHIFT_MAX - PAGE_SHIFT)
 
 /*