checkpatch: Fix newline detection in error_setg() & friends

Commit 5d596c24's regexp assumes the error message string is the first
argument.  Correct for error_report(), wrong for all the others.
Relax the regexp to match newline in anywhere.  This might cause
additional false positives.

While there, update the list of error_reporting functions.

Cc: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1470224274-31522-3-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

scripts/checkpatch.pl

@@ -2514,11 +2514,14 @@ sub process {
 	my $qemu_error_funcs = qr{error_setg|
 				error_setg_errno|
 				error_setg_win32|
+				error_setg_file_open|
 				error_set|
+				error_prepend|
+				error_reportf_err|
 				error_vreport|
 				error_report}x;
 
-	if ($rawline =~ /\b(?:$qemu_error_funcs)\s*\(\s*\".*\\n/) {
+	if ($rawline =~ /\b(?:$qemu_error_funcs)\s*\(.*\".*\\n/) {
 		WARN("Error messages should not contain newlines\n" . $herecurr);
 	}