qemu-io: Fix return value handling of bdrv_open

bdrv_open may return -errno so we have to check
if the return value is '< 0', not '== -1'.

Signed-off-by: Ryota Ozaki <ozaki.ryota@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

diff --git a/qemu-io.c b/qemu-io.c
index b2f2f5a..2f195bf 100644 (file)
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -1284,7 +1284,7 @@ static int openfile(char *name, int flags, int growable)
                flags |= BDRV_O_FILE;
        }
 
-       if (bdrv_open(bs, name, flags) == -1) {
+       if (bdrv_open(bs, name, flags) < 0) {
                fprintf(stderr, "%s: can't open device %s\n", progname, name);
                bs = NULL;
                return 1;