Allocate more space for the base64 output we need to generate.

Closes issue #10913, reported by tootai, who graciously granted us access
to his Asterisk server, thanks! Daniel, feel free to reopen the bug in
case you can reproduce this on 1.4.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@85551 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_jabber.c

@@ -561,10 +561,10 @@ static int aji_start_sasl(iksparser *prs, enum ikssasltype type, char *username,
 	iks_insert_attrib(x, "xmlns", IKS_NS_XMPP_SASL);
 	len = strlen(username) + strlen(pass) + 3;
 	s = alloca(len);
-	base64 = alloca((len + 1) * 4 / 3);
+	base64 = alloca((len + 2) * 4 / 3);
 	iks_insert_attrib(x, "mechanism", "PLAIN");
 	snprintf(s, len, "%c%s%c%s", 0, username, 0, pass);
-	ast_base64encode(base64, (const unsigned char *) s, len, (len + 1) * 4 / 3);
+	ast_base64encode(base64, (const unsigned char *) s, len, (len + 2) * 4 / 3);
 	iks_insert_cdata(x, base64, 0);
 	iks_send(prs, x);
 	iks_delete(x);