daemon: Don't need to prefix error messages with the command name.

The RPC stubs already prefix the command name to error messages.
The daemon doesn't have to do this.  As a (small) benefit this also
makes the daemon slightly smaller.

Code in the daemon such as:

  if (argv[0] == NULL) {
    reply_with_error ("passed an empty list");
    return NULL;
  }

now results in error messages like this:

  ><fs> command ""
  libguestfs: error: command: passed an empty list

(whereas previously you would have seen ..command: command:..)

1 files changed, 2 insertions, 2 deletions

diff --git a/daemon/swap.c b/daemon/swap.c
index 2d3d9ff4..fbeb895f 100644
--- a/daemon/swap.c
+++ b/daemon/swap.c
@@ -58,7 +58,7 @@ mkswap (const char *device, const char *flag, const char *value)
     r = command (NULL, &err, "/sbin/mkswap", "-f", flag, value, device, NULL);
 
   if (r == -1) {
-    reply_with_error ("mkswap: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -115,7 +115,7 @@ swaponoff (const char *cmd, const char *flag, const char *value)
     r = command (NULL, &err, cmd, flag, value, NULL);
 
   if (r == -1) {
-    reply_with_error ("%s: %s: %s", cmd, value, err);
+    reply_with_error ("%s: %s", value, err);
     free (err);
     return -1;
   }