obs-outputs: Fix assign instead of compare on socket address type

Detected by Coverity Scan (CID 92187, 92170)

plugins/obs-outputs/rtmp-stream.c

@@ -524,7 +524,7 @@ static void win32_log_interface_type(struct rtmp_stream *stream)
 
 	if (rtmp->m_bindIP.addrLen == 0)
 		source_addr = 0;
-	else if (rtmp->m_bindIP.addr.ss_family = AF_INET)
+	else if (rtmp->m_bindIP.addr.ss_family == AF_INET)
 		source_addr = (*(struct sockaddr_in*)&rtmp->m_bindIP)
 			.sin_addr.S_un.S_addr;
 	else