avformat/http: Fix leak when using deprecated option

When the deprecated option "user-agent" was set to something different
than its default value, said option would always precede and overwrite
the ordinary user_agent option (regardless of whether it was explicitly
set) which leads to a leak of the user_agent option (which has a default
value, so the leak happens always).
Fix this by setting the same destination for both options; the last
option applied wins then.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavformat/http.c

@@ -78,9 +78,6 @@ typedef struct HTTPContext {
     char *http_version;
     char *user_agent;
     char *referer;
-#if FF_API_HTTP_USER_AGENT
-    char *user_agent_deprecated;
-#endif
     char *content_type;
     /* Set if the server correctly handles Connection: close and will close
      * the connection after feeding us the content. */
@@ -145,7 +142,7 @@ static const AVOption options[] = {
     { "user_agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, { .str = DEFAULT_USER_AGENT }, 0, 0, D },
     { "referer", "override referer header", OFFSET(referer), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },
 #if FF_API_HTTP_USER_AGENT
-    { "user-agent", "use the \"user_agent\" option instead", OFFSET(user_agent_deprecated), AV_OPT_TYPE_STRING, { .str = DEFAULT_USER_AGENT }, 0, 0, D|AV_OPT_FLAG_DEPRECATED },
+    { "user-agent", "use the \"user_agent\" option instead", OFFSET(user_agent), AV_OPT_TYPE_STRING, { .str = DEFAULT_USER_AGENT }, 0, 0, D|AV_OPT_FLAG_DEPRECATED },
 #endif
     { "multiple_requests", "use persistent connections", OFFSET(multiple_requests), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, D | E },
     { "post_data", "set custom HTTP post data", OFFSET(post_data), AV_OPT_TYPE_BINARY, .flags = D | E },
@@ -1321,12 +1318,6 @@ static int http_connect(URLContext *h, const char *path, const char *local_path,
         }
     }
 
-#if FF_API_HTTP_USER_AGENT
-    if (strcmp(s->user_agent_deprecated, DEFAULT_USER_AGENT)) {
-        s->user_agent = av_strdup(s->user_agent_deprecated);
-    }
-#endif
-
     av_bprintf(&request, "%s ", method);
     bprint_escaped_path(&request, path);
     av_bprintf(&request, " HTTP/1.1\r\n");