qemu-nbd: Use program name in error messages

This changes output from:

$ qemu-nbd nosuch
Failed to blk_new_open 'nosuch': Could not open 'nosuch': No such file or directory

to something more consistent with qemu-img and qemu:

$ qemu-nbd nosuch
qemu-nbd: Failed to blk_new_open 'nosuch': Could not open 'nosuch': No such file or directory

Update the lone affected test to match.  (Hmm - is it sad that we don't
do much testing of expected failures?)

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20181215135324.152629-2-eblake@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/qemu-nbd.c b/qemu-nbd.c
index ca7109652e..e169b839ec 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -571,6 +571,7 @@ int main(int argc, char **argv)
 #endif
 
     module_call_init(MODULE_INIT_TRACE);
+    error_set_progname(argv[0]);
     qcrypto_init(&error_fatal);
 
     module_call_init(MODULE_INIT_QOM);