create-diff-object: ensure debug sections don't use dynrelas

Debug sections are intended to refer to the patch module only.  And in
fact, any debug section references to non-included symbols are stripped
in kpatch_include_debug_sections().  So there's no need for
need_dynrela() to even think about it.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>

Author: jpoimboe

kpatch-build/create-diff-object.c

@@ -3037,6 +3037,9 @@ static bool need_dynrela(struct kpatch_elf *kelf, struct lookup_table *table,
 {
 	struct lookup_result symbol;
 
+	if (is_debug_section(sec))
+		return false;
+
 	/*
 	 * These references are treated specially by the module loader and
 	 * should never be converted to dynrelas.