printk: add KERN_DEFAULT loglevel to print_modules()

Several WARN_ON() messages omit the '\n' at the end of the string, which
is a simple (and understandable) error.  The next line printed after
that warning line is usually the current module list, and that printk
does not have a log-level marker - resulting in one long mixed-up line.

Adding this loglevel marker will now avoid this unreadable mess.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/module.c

@@ -2899,7 +2899,7 @@ void print_modules(void)
 	struct module *mod;
 	char buf[8];
 
-	printk("Modules linked in:");
+	printk(KERN_DEFAULT "Modules linked in:");
 	/* Most callers should already have preempt disabled, but make sure */
 	preempt_disable();
 	list_for_each_entry_rcu(mod, &modules, list)