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>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/isdn/capi/capiutil.c b/drivers/isdn/capi/capiutil.c
index 36835ef3f340..36c1b37cea0a 100644
--- a/drivers/isdn/capi/capiutil.c
+++ b/drivers/isdn/capi/capiutil.c
@@ -489,12 +489,17 @@ static char *mnames[] =
  * @cmd:        command number
  * @subcmd:     subcommand number
  *
- * Return value: static string, NULL if command/subcommand unknown
+ * Return value: static string
  */
 
 char *capi_cmd2str(u8 cmd, u8 subcmd)
 {
-        return mnames[command_2_index(cmd, subcmd)];
+        char *result;
+
+        result = mnames[command_2_index(cmd, subcmd)];
+        if (result == NULL)
+                result = "INVALID_COMMAND";
+        return result;
 }