Fix for -s string matching (#756567, Tony Missana)

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1006 f882894a-f735-0410-b71e-b25c423dba1c

plugins/check_snmp.c

@@ -259,7 +259,7 @@ main (int argc, char **argv)
 
 		/* Process this block for string matching */
 		else if (eval_method[i] & CRIT_STRING) {
-			if (strcmp (response, string_value))
+			if (strcmp (show, string_value))
 				iresult = STATE_CRITICAL;
 			else
 				iresult = STATE_OK;