Fixed SF.net bug 2555775, threshold can be double for check_smtp

Thanks to Roman Fiedler for reporting the issue and providing a fix

THANKS.in

@@ -281,3 +281,4 @@ Brian De Wolf
 Richard Leitner
 Diego Elio Pettenò
 Vaclav Ovsik
+Roman Fiedler

plugins/check_smtp.c

@@ -99,9 +99,9 @@ char **responses = NULL;
 char *authtype = NULL;
 char *authuser = NULL;
 char *authpass = NULL;
-int warning_time = 0;
+double warning_time = 0;
 int check_warning_time = FALSE;
-int critical_time = 0;
+double critical_time = 0;
 int check_critical_time = FALSE;
 int verbose = 0;
 int use_ssl = FALSE;
@@ -417,9 +417,9 @@ main (int argc, char **argv)
 	elapsed_time = (double)microsec / 1.0e6;
 
 	if (result == STATE_OK) {
-		if (check_critical_time && elapsed_time > (double) critical_time)
+		if (check_critical_time && elapsed_time > critical_time)
 			result = STATE_CRITICAL;
-		else if (check_warning_time && elapsed_time > (double) warning_time)
+		else if (check_warning_time && elapsed_time > warning_time)
 			result = STATE_WARNING;
 	}
 
@@ -552,21 +552,19 @@ process_arguments (int argc, char **argv)
 			nresponses++;
 			break;
 		case 'c':									/* critical time threshold */
-			if (is_intnonneg (optarg)) {
-				critical_time = atoi (optarg);
-				check_critical_time = TRUE;
-			}
+			if (!is_nonnegative (optarg))
+				usage4 (_("Critical time must be a positive"));
 			else {
-				usage4 (_("Critical time must be a positive integer"));
+				critical_time = strtod (optarg, NULL);
+				check_critical_time = TRUE;
 			}
 			break;
 		case 'w':									/* warning time threshold */
-			if (is_intnonneg (optarg)) {
-				warning_time = atoi (optarg);
-				check_warning_time = TRUE;
-			}
+			if (!is_nonnegative (optarg))
+				usage4 (_("Warning time must be a positive"));
 			else {
-				usage4 (_("Warning time must be a positive integer"));
+				warning_time = strtod (optarg, NULL);
+				check_warning_time = TRUE;
 			}
 			break;
 		case 'v':									/* verbose */