Mark the func pointer as __dead2. It looks up loader_main, which

either aborts or exits, but never returns. Tag it as a non-returning
function rather than supply a bogus return(0) at the end of main.

CID: 1382885
Sponsored by: Netflix

stand/userboot/test/test.c

@@ -422,7 +422,7 @@ int
 main(int argc, char** argv)
 {
 	void *h;
-	void (*func)(struct loader_callbacks *, void *, int, int);
+	void (*func)(struct loader_callbacks *, void *, int, int) __dead2;
 	int opt;
 	char *disk_image = NULL;
 	const char *userboot_obj = "/boot/userboot.so";