Check return value of EVP_PKEY_new

Reviewed-by: NPaul Yang <yang.yang@baishancloud.com>
Reviewed-by: NNicola Tuveri <nic.tuv@gmail.com>
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7427)

apps/rsa.c

@@ -269,6 +269,9 @@ int rsa_main(int argc, char **argv)
     } else if (outformat == FORMAT_MSBLOB || outformat == FORMAT_PVK) {
         EVP_PKEY *pk;
         pk = EVP_PKEY_new();
+        if (pk == NULL)
+            goto end;
+
         EVP_PKEY_set1_RSA(pk, rsa);
         if (outformat == FORMAT_PVK) {
             if (pubin) {