iptaccount: fix being a no-op program

A PPC system has been observed where "char" is unsigned; with that,
the getopt loop will never terminate because optchar != -1 could not
happen.

doc/changelog.txt

@@ -7,6 +7,7 @@ v2.2 (2013-03-07)
 =================
 Enhancements:
 - Support for Linux 3.9
+- iptaccount: fix entire program being erroneously optimized away on PPC
 
 
 v2.1 (2012-11-27)

extensions/ACCOUNT/iptaccount.c

@@ -64,7 +64,7 @@ int main(int argc, char *argv[])
 	struct ipt_ACCOUNT_context ctx;
 	struct ipt_acc_handle_ip *entry;
 	int i;
-	char optchar;
+	int optchar;
 	bool doHandleUsage = false, doHandleFree = false, doTableNames = false;
 	bool doFlush = false, doContinue = false, doCSV = false;