app/fib: fix division by zero

[ upstream commit a01070d ]

This patch fixes the division by 0, which occurs if the number of
routes is less than 10.
Can be triggered by passing -n argument with value < 10:

./dpdk-test-fib -- -n 9
...
Floating point exception (core dumped)

Fixes: 103809d ("app/test-fib: add test application for FIB")

Signed-off-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>
Acked-by: Kevin Traynor <ktraynor@redhat.com>

app/test-fib/main.c

@@ -711,6 +711,10 @@ parse_opts(int argc, char **argv)
 				print_usage();
 				rte_exit(-EINVAL, "Invalid option -n\n");
 			}
+
+			if (config.nb_routes < config.print_fract)
+				config.print_fract = config.nb_routes;
+
 			break;
 		case 'd':
 			distrib_string = optarg;
@@ -1240,6 +1244,10 @@ main(int argc, char **argv)
 		config.nb_routes = 0;
 		while (fgets(line, sizeof(line), fr) != NULL)
 			config.nb_routes++;
+
+		if (config.nb_routes < config.print_fract)
+			config.print_fract = config.nb_routes;
+
 		rewind(fr);
 	}