fs/fs-writeback.c: remove redundant if check

b_more_io non-empty check is already preceded by an opposite check.

Link: http://lkml.kernel.org/r/1478591249-30641-1-git-send-email-tahsin@google.com
Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/fs-writeback.c

@@ -1769,15 +1769,13 @@ static long wb_writeback(struct bdi_writeback *wb,
 		 * become available for writeback. Otherwise
 		 * we'll just busyloop.
 		 */
-		if (!list_empty(&wb->b_more_io))  {
-			trace_writeback_wait(wb, work);
-			inode = wb_inode(wb->b_more_io.prev);
-			spin_lock(&inode->i_lock);
-			spin_unlock(&wb->list_lock);
-			/* This function drops i_lock... */
-			inode_sleep_on_writeback(inode);
-			spin_lock(&wb->list_lock);
-		}
+		trace_writeback_wait(wb, work);
+		inode = wb_inode(wb->b_more_io.prev);
+		spin_lock(&inode->i_lock);
+		spin_unlock(&wb->list_lock);
+		/* This function drops i_lock... */
+		inode_sleep_on_writeback(inode);
+		spin_lock(&wb->list_lock);
 	}
 	spin_unlock(&wb->list_lock);
 	blk_finish_plug(&plug);