error: Use error_report_err() where appropriate (again)

Same Coccinelle semantic patch as in commit 565f65d.

We now use the original error whole instead of just its message
obtained with error_get_pretty().  This avoids suppressing its hint
(see commit 50b7b00), but I don't think the errors touched in this
commit can come with hints.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1450452927-8346-3-git-send-email-armbru@redhat.com>

block/sheepdog.c

@@ -1861,8 +1861,7 @@ static int sd_create(const char *filename, QemuOpts *opts,
 
         fd = connect_to_sdog(s, &local_err);
         if (fd < 0) {
-            error_report("%s", error_get_pretty(local_err));
-            error_free(local_err);
+            error_report_err(local_err);
             ret = -EIO;
             goto out;
         }