Allow explicit setting of a number of files

We currently only allow filename=foo for one file, add the possibility
to specify any number of files by seperating with a colon.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/engines/net.c b/engines/net.c
index 2e136f3..c2f45e5 100644
--- a/engines/net.c
+++ b/engines/net.c
@@ -223,8 +223,9 @@
 	unsigned short port;
 	struct fio_file *f;
 	char host[64], buf[128];
+	unsigned int i;
 	char *sep;
-	int ret, i;
+	int ret;
 
 	if (!td->total_file_size) {
 		log_err("fio: need size= set\n");