checkpatch.pl: Add 'debug' to the list of logFunctions

While the kernel mainly uses pr_debug(...), etc, for debug messages, we
use debug(...).  Add this to the list of logFunctions so that they are
correctly checked (and not warned against) for long string literals.

Signed-off-by: Tom Rini <trini@ti.com>

tools/checkpatch.pl

@@ -272,6 +272,7 @@ our $logFunctions = qr{(?x:
 	[a-z0-9]+_(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
 	WARN(?:_RATELIMIT|_ONCE|)|
 	panic|
+	debug|
 	MODULE_[A-Z_]+
 )};