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

Commit 9af9e0f, 6daf194d, be62a2eb and 312fd5f got rid of a bunch, but
they keep coming back.  checkpatch.pl tries to flag them since commit
5d596c2, but it's not very good at it.  Offenders tracked down with
Coccinelle script scripts/coccinelle/err-bad-newline.cocci, an updated
version of the script from commit 312fd5f.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1470224274-31522-2-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index f10d5ec..6a68e59 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -744,7 +744,7 @@
     }
 
     /* Stick unknown stuff at the end. */
-    error_report("warning: Unknown firmware file in legacy mode: %s\n", name);
+    error_report("warning: Unknown firmware file in legacy mode: %s", name);
     return FW_CFG_ORDER_OVERRIDE_LAST;
 }