codetag: Run module_load hooks for builtin codetags

The module_load callback should still run for builtin codetags that
define it, even in a non-modular kernel. (i.e. for the cmod->mod == NULL
case).

Signed-off-by: Kees Cook <kees@kernel.org>

lib/codetag.c

diff --git a/lib/codetag.c b/lib/codetag.c
index 5ace625..ef7634c 100644
--- a/lib/codetag.c
+++ b/lib/codetag.c
@@ -125,7 +125,6 @@ static inline size_t range_size(const struct codetag_type *cttype,
 			cttype->desc.tag_size;
 }
 
-#ifdef CONFIG_MODULES
 static void *get_symbol(struct module *mod, const char *prefix, const char *name)
 {
 	DECLARE_SEQ_BUF(sb, KSYM_NAME_LEN);
@@ -199,6 +198,7 @@ static int codetag_module_init(struct codetag_type *cttype, struct module *mod)
 	return 0;
 }
 
+#ifdef CONFIG_MODULES
 void codetag_load_module(struct module *mod)
 {
 	struct codetag_type *cttype;
@@ -248,9 +248,6 @@ bool codetag_unload_module(struct module *mod)
 
 	return unload_ok;
 }
-
-#else /* CONFIG_MODULES */
-static int codetag_module_init(struct codetag_type *cttype, struct module *mod) { return 0; }
 #endif /* CONFIG_MODULES */
 
 struct codetag_type *