creator/find_file(): fix an incorrect error that gets raised.

In find_file(), when we're trying to find the device that matches a
mountpoint, we incorrectly raise an error when we find an entry that's
got a longer name than the one we want.  This is incorrect - it's a
special case of what Lans Zhang was fixing in 8eac2d5, in fact.

This case should just reject *that* entry, not set an error and end the
iteration.

Signed-off-by: Peter Jones <pjones@redhat.com>

src/creator.c

@@ -108,10 +108,8 @@ find_file(const char * const filepath, char **devicep, char **relpathp)
 
 		if (dsb.st_rdev == fsb.st_dev) {
 			ssize_t mntlen = strlen(me->mnt_dir);
-			if (mntlen >= linklen) {
-				errno = ENAMETOOLONG;
-				goto err;
-			}
+			if (mntlen != linklen)
+				continue;
 			if (strncmp(linkbuf, me->mnt_dir, mntlen))
 				continue;
 			*devicep = strdup(me->mnt_fsname);