drm: use ENOMEM for drmm_kzalloc allocation failures

Other callers of drmm_kzalloc already return -ENOMEM on allocation
failure. Change EINVAL to ENOMEM for consistency.
Signed-off-by: Niels Dossche <dossche.niels@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220521234104.88410-1-dossche.niels@gmail.com

drivers/gpu/drm/drm_encoder.c

@@ -226,7 +226,7 @@ void *__drmm_encoder_alloc(struct drm_device *dev, size_t size, size_t offset,
 
 	container = drmm_kzalloc(dev, size, GFP_KERNEL);
 	if (!container)
-		return ERR_PTR(-EINVAL);
+		return ERR_PTR(-ENOMEM);
 
 	encoder = container + offset;