watchdog: diag288_wdt: Remove KMSG_COMPONENT macro

The KMSG_COMPONENT macro is a leftover of the s390 specific "kernel message
catalog" from 2008 [1] which never made it upstream.

The macro was added to s390 code to allow for an out-of-tree patch which
used this to generate unique message ids. Also this out-of-tree doesn't
exist anymore.

Remove the macro in order to get rid of a pointless indirection.

[1] https://lwn.net/Articles/292650/

Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Heiko Carstens <[e-mail]>

drivers/watchdog/diag288_wdt.c

···
  *
  */
 
-#define KMSG_COMPONENT "diag288_wdt"
-#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+#define pr_fmt(fmt) "diag288_wdt: " fmt
 
 #include <linux/init.h>
 #include <linux/kernel.h>