Correct misuse of ast_strip_quoted() when getting a Diversion header's reason parameter.

The use here was assuming that the pointer would be updated, but the updated string
is actually returned by ast_strip_quoted() instead.
........

Merged revisions 366597 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@366598 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -15662,7 +15662,7 @@ static int get_rdnis(struct sip_pvt *p, struct sip_request *oreq, char **name, c
 			}
 			/* Remove enclosing double-quotes */
 			if (*reason_param == '"')
-				ast_strip_quoted(reason_param, "\"", "\"");
+				reason_param = ast_strip_quoted(reason_param, "\"", "\"");
 			if (!ast_strlen_zero(reason_param)) {
 				sip_set_redirstr(p, reason_param);
 				if (p->owner) {