From 340184b35ac8786bdb574d2c8ce8e4f1269ec4da Mon Sep 17 00:00:00 2001
From: Tilman Schmidt <tilman@imap.cc>
Date: Sat, 11 Oct 2014 13:46:30 +0200
Subject: [PATCH] isdn/capi: don't return NULL from capi_cmd2str()

capi_cmd2str() is used in many places to build log messages.
None of them is prepared to handle NULL as a result.
Change the function to return printable string "INVALID_COMMAND"
instead.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Reading git-format-patch failed