librtmp: Don't free the temp url at the end of rtmp_open

librtmp can keep pointers to this string internally, and may
use them at shutdown as well.

CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit 86546109)
Signed-off-by: Reinhard Tartler <siretart@tauware.de>

Conflicts:
	libavformat/librtmp.c

libavformat/librtmp.c

@@ -38,6 +38,7 @@ typedef struct LibRTMPContext {
     RTMP rtmp;
     char *app;
     char *playpath;
+    char *temp_filename;
 } LibRTMPContext;
 
 static void rtmp_log(int level, const char *fmt, va_list args)
@@ -62,6 +63,7 @@ static int rtmp_close(URLContext *s)
     RTMP *r = &ctx->rtmp;
 
     RTMP_Close(r);
+    av_freep(&ctx->temp_filename);
     return 0;
 }
 
@@ -101,7 +103,7 @@ static int rtmp_open(URLContext *s, const char *uri, int flags)
         if (ctx->app)      len += strlen(ctx->app)      + sizeof(" app=");
         if (ctx->playpath) len += strlen(ctx->playpath) + sizeof(" playpath=");
 
-        if (!(filename = av_malloc(len)))
+        if (!(ctx->temp_filename = filename = av_malloc(len)))
             return AVERROR(ENOMEM);
 
         av_strlcpy(filename, s->filename, len);
@@ -130,10 +132,9 @@ static int rtmp_open(URLContext *s, const char *uri, int flags)
     }
 
     s->is_streamed = 1;
-    rc = 0;
+    return 0;
 fail:
-    if (filename != s->filename)
-        av_freep(&filename);
+    av_freep(&ctx->temp_filename);
     return rc;
 }