MT#59038 Fix a defect detected by Coverity Scan (websocket)

Fix for:

*** CID 1583599:  Code maintainability issues  (UNUSED_VALUE)
/daemon/websocket.c: 668 in websocket_http_body()
662                     return 0;
663             }
664
665             ilogs(http, LOG_DEBUG, "HTTP body complete: '%.*s'", (int) wm->body->len, wm->body->str);
666
667             if (!strcmp(uri, "/ng") && wm->method == M_POST && wm->content_type == CT_NG)
>>>     CID 1583599:  Code maintainability issues  (UNUSED_VALUE)
>>>     Assigning value from "websocket_http_ng" to "handler" here, but that stored value is overwritten before it can be used.
668                     handler = websocket_http_ng;
669             if (!strcmp(uri, "/ng-plain") && wm->method == M_POST
670                             && (wm->content_type == CT_NG || wm->content_type == CT_JSON))
671                     handler = websocket_http_ng_plain;
672             else if (!strcmp(uri, "/admin") && wm->method == M_POST && wm->content_type == CT_JSON)
673                     handler = websocket_janus_process;

Change-Id: I08df9fade9cbe3bf8e0f54c9efcc98fd25353c5e

daemon/websocket.c

@@ -666,7 +666,7 @@ static int websocket_http_body(struct websocket_conn *wc, const char *body, size
 
 	if (!strcmp(uri, "/ng") && wm->method == M_POST && wm->content_type == CT_NG)
 		handler = websocket_http_ng;
-	if (!strcmp(uri, "/ng-plain") && wm->method == M_POST
+	else if (!strcmp(uri, "/ng-plain") && wm->method == M_POST
 			&& (wm->content_type == CT_NG || wm->content_type == CT_JSON))
 		handler = websocket_http_ng_plain;
 	else if (!strcmp(uri, "/admin") && wm->method == M_POST && wm->content_type == CT_JSON)