add null cipher to FIPS module
diff --git a/Makefile.fips b/Makefile.fips
index 619b9cd..e60a728 100644
--- a/Makefile.fips
+++ b/Makefile.fips
@@ -329,6 +329,7 @@
 	../crypto/ecdsa/ecs_ossl.o \
 	../crypto/evp/e_aes.o \
 	../crypto/evp/e_des3.o \
+	../crypto/evp/e_null.o \
 	../crypto/evp/m_sha1.o \
 	../crypto/evp/m_dss1.o \
 	../crypto/evp/m_dss.o \