drm: simplify kcalloc() call to kzalloc().

Calls to kcalloc() for a single element can be simplified to calls to
kzalloc().
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Cc: Dave Airlie <airlied@linux.ie>
Cc: Eric Anholt <eric@anholt.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_gem.c

@@ -133,7 +133,7 @@ drm_gem_object_alloc(struct drm_device *dev, size_t size)
 
 	BUG_ON((size & (PAGE_SIZE - 1)) != 0);
 
-	obj = kcalloc(1, sizeof(*obj), GFP_KERNEL);
+	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
 
 	obj->dev = dev;
 	obj->filp = shmem_file_setup("drm mm object", size, VM_NORESERVE);