Ensure non-void functions have a return at the end, even though it shouldn't get there, to squash warning.

utils/nsurl.c

@@ -1483,6 +1483,8 @@ lwc_string *nsurl_get_component(const nsurl *url, nsurl_component part)
 		LOG(("Unsupported value passed to part param."));
 		assert(0);
 	}
+
+	return NULL;
 }
 
 
@@ -1547,6 +1549,8 @@ bool nsurl_has_component(const nsurl *url, nsurl_component part)
 		LOG(("Unsupported value passed to part param."));
 		assert(0);
 	}
+
+	return false;
 }