usb: typec: ucsi: ccg: Fix uninitilized symbol error

Fix smatch error:
drivers/usb/typec/ucsi/ucsi_ccg.c:975 ccg_fw_update() error: uninitialized symbol 'err'.

Fixes: 5c9ae5a8 ("usb: typec: ucsi: ccg: add firmware flashing support")
Cc: stable@vger.kernel.org
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20190801075512.24354-1-heikki.krogerus@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/ucsi/ucsi_ccg.c

@@ -1018,7 +1018,7 @@ static int do_flash(struct ucsi_ccg *uc, enum enum_flash_mode mode)
  ******************************************************************************/
 static int ccg_fw_update(struct ucsi_ccg *uc, enum enum_flash_mode flash_mode)
 {
-	int err;
+	int err = 0;
 
 	while (flash_mode != FLASH_NOT_NEEDED) {
 		err = do_flash(uc, flash_mode);