clang-tidy: do not use else after return

Found with readability-else-after-return

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libj1939.c

@@ -64,8 +64,8 @@ static const char *libj1939_ifnam(int ifindex)
 		 */
 		libj1939_cleanup();
 		return libj1939_ifnam(ifindex);
-	} else
-		return NULL;
+	}
+	return NULL;
 }
 
 /* retrieve index */
@@ -88,8 +88,8 @@ static int libj1939_ifindex(const char *str)
 	if (cached) {
 		libj1939_cleanup();
 		return libj1939_ifindex(str);
-	} else
-		return 0;
+	}
+	return 0;
 }
 
 void libj1939_parse_canaddr(char *spec, struct sockaddr_can *paddr)