Strip blank end/front of filenames

We do this for other options.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/init.c b/init.c
index ba932bf..888e68b 100644
--- a/init.c
+++ b/init.c
@@ -1111,7 +1111,13 @@
 
 	td->nr_files = 0;
 	p = str = strdup(input);
+
+	strip_blank_front(&str);
+	strip_blank_end(str);
+
 	while ((fname = strsep(&str, ":")) != NULL) {
+		if (!strlen(fname))
+			break;
 		add_file(td, fname);
 		td->nr_files++;
 	}