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

Commit 6daf194d and be62a2eb got rid of a bunch, but they keep coming
back.  Tracked down with this Coccinelle semantic patch:

    @r@
	expression err, eno, cls, fmt;
	position p;
    @@
    (
	error_report(fmt, ...)@p
    |
	error_set(err, cls, fmt, ...)@p
    |
	error_set_errno(err, eno, cls, fmt, ...)@p
    |
	error_setg(err, fmt, ...)@p
    |
	error_setg_errno(err, eno, fmt, ...)@p
    )
    @script:python@
	fmt << r.fmt;
	p << r.p;
    @@
    if "\\n" in str(fmt):
	print "%s:%s:%s:%s" % (p[0].file, p[0].line, p[0].column, fmt)

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-id: 1360354939-10994-4-git-send-email-armbru@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/hmp.c b/hmp.c
index 420d48b..2f47a8a 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1365,7 +1365,7 @@
 
     opts = qemu_opts_parse(qemu_find_opts("chardev"), args, 1);
     if (opts == NULL) {
-        error_setg(&err, "Parsing chardev args failed\n");
+        error_setg(&err, "Parsing chardev args failed");
     } else {
         qemu_chr_new_from_opts(opts, NULL, &err);
     }