staging: rts5208: remove unnecessary return statement

This fixes the warning:
WARNING: void function return statements are not generally useful
Signed-off-by: NRoxana Blaj <roxanagabriela10@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rts5208/ms.c

@@ -2776,8 +2776,6 @@ void mspro_polling_format_status(struct rtsx_chip *chip)
 				break;
 		}
 	}
-
-	return;
 }
 
 int mspro_format(struct scsi_cmnd *srb, struct rtsx_chip *chip,