rpc: Don't overwrite virAuthGet{Username|Password}Path errors

Now that the virAuthGet*Path API's generate all the error messages
we can remove them from the callers.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
Reviewed-by: NMarcos Paulo de Souza <marcos.souza.org@gmail.com>

src/rpc/virnetlibsshsession.c

@@ -637,8 +637,6 @@ virNetLibsshAuthenticatePassword(virNetLibsshSessionPtr sess,
             if (!(password = virAuthGetPasswordPath(sess->authPath, sess->cred,
                                                     "ssh", sess->username,
                                                     sess->hostname))) {
-                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                               _("failed to retrieve password"));
                 ret = SSH_AUTH_ERROR;
                 goto cleanup;
             }

src/rpc/virnetsshsession.c

@@ -726,11 +726,8 @@ virNetSSHAuthenticatePassword(virNetSSHSessionPtr sess,
         while (true) {
             if (!(password = virAuthGetPasswordPath(sess->authPath, sess->cred,
                                                     "ssh", priv->username,
-                                                    sess->hostname))) {
-                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                               _("failed to retrieve password"));
+                                                    sess->hostname)))
                 goto cleanup;
-            }
 
             /* tunelled password authentication */
             if ((rc = libssh2_userauth_password(sess->session,