tty: tty_buffer.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/tty_buffer.c

@@ -262,7 +262,8 @@ static int __tty_buffer_request_room(struct tty_port *port, size_t size,
 	change = (b->flags & TTYB_NORMAL) && (~flags & TTYB_NORMAL);
 	if (change || left < size) {
 		/* This is the slow path - looking for new buffers to use */
-		if ((n = tty_buffer_alloc(port, size)) != NULL) {
+		n = tty_buffer_alloc(port, size);
+		if (n != NULL) {
 			n->flags = flags;
 			buf->tail = n;
 			b->commit = b->used;