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nlplug-findfs: support search for /dev/<devname>

this is so we also can specify cryptroot=/dev/sdaX at boot prompt

--- a/nlplug-findfs.c

+++ b/nlplug-findfs.c

@@ -430,7 +430,9 @@

 	if (searchdev == NULL && bootrepos == NULL && apkovls == NULL)

 		return 0;

-	if (searchdev && strcmp(devname, searchdev) == 0) {

+	snprintf(devnode, sizeof(devnode), "/dev/%s", devname);

+	if (searchdev && (strcmp(devname, searchdev) == 0

+	                  || strcmp(devnode, searchdev) == 0)) {

 		return FOUND_DEVICE;

 	}

@@ -437,7 +439,6 @@

 	if (cache == NULL)

 		blkid_get_cache(&cache, NULL);

-	snprintf(devnode, sizeof(devnode), "/dev/%s", devname);

 	type = blkid_get_tag_value(cache, "TYPE", devnode);

 	if (searchdev != NULL) {