res_rtp_asterisk: Fix ref leaks in ast_rtcp_read().

Moved rtcp_report RAII_VAR declaration into the loop so it is unref'ed
after every loop.  Moved message_blob to loop and switched it to a regular
variable.  The regular variable was used since message_blob is used in a
very contained way.

(closes issue ASTERISK-22565)
Reported by: Corey Farrell
Patches:
      rtcp_report-leak.patch (license #5909) patch uploaded by Corey Farrell
Tested by: Corey Farrell
........

Merged revisions 399607 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@399608 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_rtp_asterisk.c

@@ -3210,10 +3210,6 @@ static struct ast_frame *ast_rtcp_read(struct ast_rtp_instance *instance)
 	int res, packetwords, position = 0;
 	int report_counter = 0;
 	struct ast_rtp_rtcp_report_block *report_block;
-	RAII_VAR(struct ast_rtp_rtcp_report *, rtcp_report,
-			NULL,
-			ao2_cleanup);
-	RAII_VAR(struct ast_json *, message_blob, NULL, ast_json_unref);
 	struct ast_frame *f = &ast_null_frame;
 
 	/* Read in RTCP data from the socket */
@@ -3274,6 +3270,8 @@ static struct ast_frame *ast_rtcp_read(struct ast_rtp_instance *instance)
 	while (position < packetwords) {
 		int i, pt, rc;
 		unsigned int length;
+		struct ast_json *message_blob;
+		RAII_VAR(struct ast_rtp_rtcp_report *, rtcp_report, NULL, ao2_cleanup);
 
 		i = position;
 		length = ntohl(rtcpheader[i]);
@@ -3397,6 +3395,7 @@ static struct ast_frame *ast_rtcp_read(struct ast_rtp_instance *instance)
 			ast_rtp_publish_rtcp_message(instance, ast_rtp_rtcp_received_type(),
 					rtcp_report,
 					message_blob);
+			ast_json_unref(message_blob);
 			break;
 		case RTCP_PT_FUR:
 		/* Handle RTCP FIR as FUR */