[PATCH] ubiupdatevol: make the -t parameter work again

[Sebastian Andrzej Siewior <bigeasy@linutronix.de>]

The execution of
|./ubiupdatevol /dev/ubi0 -t
will fail because 'argv[optind + 1]' is undefined and the later executed
'strcmp(args.img, "-")' will segfault.
So I can hack around and supply a dummy image or fix it that way.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 ubi-utils/new-utils/src/ubiupdatevol.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/ubi-utils/new-utils/src/ubiupdatevol.c b/ubi-utils/new-utils/src/ubiupdatevol.c
index 5eeaa3c..c83731c 100644
--- a/ubi-utils/new-utils/src/ubiupdatevol.c
+++ b/ubi-utils/new-utils/src/ubiupdatevol.c
@@ -157,10 +157,15 @@ static int parse_opt(int argc, char * const argv[])
 	args.node = argv[optind];
 	args.img  = argv[optind + 1];
 
-	if (strcmp(args.img, "-") == 0)
-		args.use_stdin = 1;
-	if (args.use_stdin && !args.size)
-		return errmsg("file size must be specified if input is stdin");
+	if (args.img && args.truncate)
+		return errmsg("You can't truncate and specify an image (use -h for help)");
+
+	if (args.img && !args.truncate) {
+		if (strcmp(args.img, "-") == 0)
+			args.use_stdin = 1;
+		if (args.use_stdin && !args.size)
+			return errmsg("file size must be specified if input is stdin");
+	}
 
 	return 0;
 }
-- 
1.5.6.5