kmemtrace: remove unnecessary casts

Now that we use _RET_IP_ there's no need to cast 'caller' to unsigned long.
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>

mm/slub.c

@@ -3269,8 +3269,8 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller)
 	ret = slab_alloc(s, gfpflags, -1, caller);
 
 	/* Honor the call site pointer we recieved. */
-	kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, (unsigned long) caller,
-			     ret, size, s->size, gfpflags);
+	kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, caller, ret, size,
+			     s->size, gfpflags);
 
 	return ret;
 }
@@ -3292,8 +3292,7 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
 	ret = slab_alloc(s, gfpflags, node, caller);
 
 	/* Honor the call site pointer we recieved. */
-	kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC,
-				  (unsigned long) caller, ret,
+	kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, caller, ret,
 				  size, s->size, gfpflags, node);
 
 	return ret;