drm/imx: imx-tve: Fix return type of imx_tve_connector_mode_valid

The mode_valid field in drm_connector_helper_funcs is expected to be of
type:
enum drm_mode_status (* mode_valid) (struct drm_connector *connector,
                                     struct drm_display_mode *mode);

The mismatched return type breaks forward edge kCFI since the underlying
function definition does not match the function hook definition.

The return type of imx_tve_connector_mode_valid should be changed from
int to enum drm_mode_status.

Reported-by: Dan Carpenter <[email protected]>
Link: ClangBuiltLinux#1703
Cc: [email protected]
Signed-off-by: Nathan Huckleberry <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Reviewed-by: Fabio Estevam <[email protected]>
Reviewed-by: Philipp Zabel <[email protected]>
Signed-off-by: Philipp Zabel <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: nhukc

drivers/gpu/drm/imx/imx-tve.c

@@ -218,8 +218,9 @@ static int imx_tve_connector_get_modes(struct drm_connector *connector)
 	return ret;
 }
 
-static int imx_tve_connector_mode_valid(struct drm_connector *connector,
-					struct drm_display_mode *mode)
+static enum drm_mode_status
+imx_tve_connector_mode_valid(struct drm_connector *connector,
+			     struct drm_display_mode *mode)
 {
 	struct imx_tve *tve = con_to_tve(connector);
 	unsigned long rate;