error: Strip trailing '\n' from error string arguments (again)

Commit 6daf194d, be62a2eb and 312fd5f got rid of a bunch, but they
keep coming back.  Tracked down with the Coccinelle semantic patch
from commit 312fd5f.

Cc: Fam Zheng <famz@redhat.com>
Cc: Peter Crosthwaite <crosthwaitepeter@gmail.com>
Cc: Bharata B Rao <bharata@linux.vnet.ibm.com>
Cc: Dominik Dingel <dingel@linux.vnet.ibm.com>
Cc: David Hildenbrand <dahi@linux.vnet.ibm.com>
Cc: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Cc: Stefan Berger <stefanb@linux.vnet.ibm.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Changchun Ouyang <changchun.ouyang@intel.com>
Cc: zhanghailiang <zhang.zhanghailiang@huawei.com>
Cc: Pavel Fedin <p.fedin@samsung.com>
Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Acked-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1450452927-8346-17-git-send-email-armbru@redhat.com>
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 99df01f..023eacd 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -554,7 +554,7 @@
         case 'k':
             sockpath = optarg;
             if (sockpath[0] != '/') {
-                error_report("socket path must be absolute\n");
+                error_report("socket path must be absolute");
                 exit(EXIT_FAILURE);
             }
             break;
@@ -571,7 +571,7 @@
                 exit(EXIT_FAILURE);
             }
             if (shared < 1) {
-                error_report("Shared device number must be greater than 0\n");
+                error_report("Shared device number must be greater than 0");
                 exit(EXIT_FAILURE);
             }
             break;