am437x-vpfe: fix an uninitialized variable bug

BugLink: https://bugs.launchpad.net/bugs/1878232

commit e4bccada upstream.

If we are doing V4L2_FIELD_NONE then "ret" is used uninitialized.

Fixes: 417d2e50 ('[media] media: platform: add VPFE capture driver support for AM437X')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/media/platform/am437x/am437x-vpfe.c

@@ -1047,7 +1047,7 @@ static int vpfe_get_ccdc_image_format(struct vpfe_device *vpfe,
 static int vpfe_config_ccdc_image_format(struct vpfe_device *vpfe)
 {
 	enum ccdc_frmfmt frm_fmt = CCDC_FRMFMT_INTERLACED;
-	int ret;
+	int ret = 0;
 
 	vpfe_dbg(2, vpfe, "vpfe_config_ccdc_image_format\n");