f2fs-tools: fixed incorrect error handling

Case of failed memory allocation of dev->zone_cap_blocks
doesn't release heap allocated rep
Found by RASU JSC
Fixes: f841085(f2fs-tools: zns zone-capacity support)
Signed-off-by: Maxim Korotkov <maskorotkov@rasu.ru>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

lib/libf2fs_zoned.c

@@ -306,6 +306,7 @@ int f2fs_check_zones(int j)
 
 	dev->zone_cap_blocks = malloc(dev->nr_zones * sizeof(size_t));
 	if (!dev->zone_cap_blocks) {
+		free(rep);
 		ERR_MSG("No memory for zone capacity list.\n");
 		return -ENOMEM;
 	}