KEYS: Remove files generated when SYSTEM_TRUSTED_KEYRING=y

Always remove generated SYSTEM_TRUSTED_KEYRING files while doing make mrproper.

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/kernel/Makefile b/kernel/Makefile
index c23bb0b..bc010ee 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -165,9 +165,9 @@
 targets += $(obj)/.x509.list
 $(obj)/.x509.list:
 	@echo $(X509_CERTIFICATES) >$@
+endif
 
 clean-files := x509_certificate_list .x509.list
-endif
 
 ifeq ($(CONFIG_MODULE_SIG),y)
 ###############################################################################