In case we are supplied with an imagename that matches a module, but not a

firmware in that module (eventhough this is a programming error) - drop the
reference to the module again.

Submitted by:	Benjamin Close
MFC after:	3 days

sys/kern/subr_firmware.c

@@ -188,6 +188,7 @@ firmware_get(const char *imagename)
 	if (requested_load) {
 		printf("%s: failed to load firmware image %s\n",
 		    __func__, imagename);
+		(void) linker_release_module(imagename, NULL, NULL);
 		return NULL;
 	}
 	td = curthread;