mm/compaction: remove unnecessary "else continue" at end of loop in isolate_freepages_block

There is no behavior change to remove "else continue" code at end of scan
loop.  Just remove it to make code cleaner.

Link: https://lkml.kernel.org/r/20230803094901.2915942-5-shikemeng@huaweicloud.comSigned-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Kemeng Shi <shikemeng@huawei.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/compaction.c

@@ -671,8 +671,6 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
 isolate_fail:
 		if (strict)
 			break;
-		else
-			continue;
 
 	}