tests: Add null checks in torture_pki_rsa.c

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

tests/unittests/torture_pki_rsa.c

@@ -352,6 +352,7 @@ static void torture_pki_rsa_duplicate_key(void **state)
 
     rc = ssh_pki_import_pubkey_file(LIBSSH_RSA_TESTKEY ".pub", &pubkey);
     assert_true(rc == 0);
+    assert_non_null(pubkey);
 
     rc = ssh_pki_export_pubkey_base64(pubkey, &b64_key);
     assert_true(rc == 0);
@@ -366,13 +367,15 @@ static void torture_pki_rsa_duplicate_key(void **state)
     assert_non_null(privkey);
 
     privkey_dup = ssh_key_dup(privkey);
-    assert_true(privkey_dup != NULL);
+    assert_non_null(privkey_dup);
 
     rc = ssh_pki_export_privkey_to_pubkey(privkey, &pubkey);
     assert_true(rc == SSH_OK);
+    assert_non_null(pubkey);
 
     rc = ssh_pki_export_pubkey_base64(pubkey, &b64_key_gen);
     assert_true(rc == 0);
+    assert_non_null(b64_key_gen);
 
     assert_string_equal(b64_key, b64_key_gen);
 
@@ -493,6 +496,7 @@ static void torture_pki_rsa_write_privkey(void **state)
                                      NULL,
                                      &origkey);
     assert_true(rc == 0);
+    assert_non_null(origkey);
 
     unlink(LIBSSH_RSA_TESTKEY);
 
@@ -509,6 +513,7 @@ static void torture_pki_rsa_write_privkey(void **state)
                                      NULL,
                                      &privkey);
     assert_true(rc == 0);
+    assert_non_null(privkey);
 
     rc = ssh_key_cmp(origkey, privkey, SSH_KEY_CMP_PRIVATE);
     assert_true(rc == 0);
@@ -523,6 +528,7 @@ static void torture_pki_rsa_write_privkey(void **state)
                                      NULL,
                                      &origkey);
     assert_true(rc == 0);
+    assert_non_null(origkey);
 
     unlink(LIBSSH_RSA_TESTKEY_PASSPHRASE);
     rc = ssh_pki_export_privkey_file(origkey,