fix static array (found with solaris 2.7 build)

security/nss/lib/freebl/blapi_bsf.c

@@ -1158,7 +1158,7 @@ static const B_ALGORITHM_METHOD *rsa_alg_chooser[] = {
 	&AM_RSA_DECRYPT,
 	&AM_RSA_CRT_ENCRYPT,
 	&AM_RSA_CRT_DECRYPT,
-	(B_ALGORITHM_METHOD)NULL_PTR
+	(B_ALGORITHM_METHOD *)NULL_PTR
 };
 
 static SECStatus