Fix FD leak if connect() fails, found by Klocwork

--HG--
extra : convert_revision : 4f7dec450bb69aee8d7789b8ab10311b1d1655bb

dbutil.c

@@ -311,6 +311,7 @@ int connect_unix(const char* path) {
 	}
 	if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
 		TRACE(("Failed to connect to '%s' socket", path))
+		m_close(fd);
 		return -1;
 	}
 	return fd;