Merged revisions 313435 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.6.2

also went ahead and fixed the problem it introduces before committing.

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  r313435 | jrose | 2011-04-12 13:44:44 -0500 (Tue, 12 Apr 2011) | 1 line

  fixing stupid mistake with putting code before variable declaration
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    Merged revisions 313433 via svnmerge from 
    https://origsvn.digium.com/svn/asterisk/branches/1.6.2
	
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      r313432 | jrose | 2011-04-12 13:12:29 -0500 (Tue, 12 Apr 2011) | 14 lines

      reload Chan_dahdi memory leak caused by variables

      chan_dahdi reloading with variables set via setvar in chan_dahdi.conf would
      stay in the dahdi_pvt structs for individual channels (causing them to just
      continue adding the new ones to the list) and also there was a memory leak
      causes by the conf objects. This patch resolves both of these by using 
      ast_variables_destroy during the loading process.

      (closes issue #17450)
      Reported by: nahuelgreco
      Patches:
          patch.diff uploaded by jrose (license 1225)
          Tested by: tilghman, jrose
      Review: https://reviewboard.asterisk.org/r/1170/
    
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@313437 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -12138,6 +12138,12 @@ static struct dahdi_pvt *mkintf(int channel, const struct dahdi_chan_conf *conf,
 	if (tmp) {
 		int chan_sig = conf->chan.sig;
 
+		/* If there are variables in tmp before it is updated to match the new config, clear them */
+		if (reloading && tmp->vars) {
+			ast_variables_destroy(tmp->vars);
+			tmp->vars = NULL;
+		}
+
 		if (!here) {
 			/* Can only get here if this is a new channel interface being created. */
 			if ((channel != CHAN_PSEUDO)) {
@@ -17817,6 +17823,13 @@ static int process_dahdi(struct dahdi_chan_conf *confp, const char *cat, struct
 		} else if (!(options & PROC_DAHDI_OPT_NOWARN) )
 			ast_log(LOG_WARNING, "Ignoring any changes to '%s' (on reload) at line %d.\n", v->name, v->lineno);
 	}
+
+	/* Since confp has already filled invidual dahdi_pvt objects with channels at this point, clear the variables in confp's pvt. */
+	if (confp->chan.vars) {
+		ast_variables_destroy(confp->chan.vars);
+		confp->chan.vars = NULL;
+	}
+
 	if (dahdichan[0]) {
 		/* The user has set 'dahdichan' */
 		/*< \todo pass proper line number instead of 0 */