drivers/char: Remove ununsed variable

drivers/char/adsprpc.c:3942:25: error: unused variable 'req_complete' [-Werror,-Wunused-variable]
        int size = 0, err = 0, req_complete = 0;
                               ^

Author: DevMashru

drivers/char/adsprpc.c

@@ -3939,7 +3939,7 @@ static long fastrpc_device_ioctl(struct file *file, unsigned int ioctl_num,
 	} i;
 	void *param = (char *)ioctl_param;
 	struct fastrpc_file *fl = (struct fastrpc_file *)file->private_data;
-	int size = 0, err = 0, req_complete = 0;
+	int size = 0, err = 0;
 	uint32_t info;
 
 	VERIFY(err, fl != NULL);