ssh: add two missing state names

The list of state names (used in debug builds) was out of sync in
relation to the list of states (used in all builds).

I now added an assert to make sure the sizes of the two lists match, to
aid in detecting this mistake better in the future.

Regression since c92d2e14cf, shipped in 7.58.0.

Reported-by: Somnath Kundu

Fixes #2312
Closes #2313

lib/ssh.c

@@ -342,6 +342,7 @@ static void state(struct connectdata *conn, sshstate nowstate)
     "SSH_AUTH_HOST",
     "SSH_AUTH_KEY_INIT",
     "SSH_AUTH_KEY",
+    "SSH_AUTH_GSSAPI",
     "SSH_AUTH_DONE",
     "SSH_SFTP_INIT",
     "SSH_SFTP_REALPATH",
@@ -376,6 +377,7 @@ static void state(struct connectdata *conn, sshstate nowstate)
     "SSH_SCP_TRANS_INIT",
     "SSH_SCP_UPLOAD_INIT",
     "SSH_SCP_DOWNLOAD_INIT",
+    "SSH_SCP_DOWNLOAD",
     "SSH_SCP_DONE",
     "SSH_SCP_SEND_EOF",
     "SSH_SCP_WAIT_EOF",
@@ -386,6 +388,9 @@ static void state(struct connectdata *conn, sshstate nowstate)
     "QUIT"
   };
 
+  /* a precaution to make sure the lists are in sync */
+  DEBUGASSERT(sizeof(names)/sizeof(names[0]) == SSH_LAST);
+
   if(sshc->state != nowstate) {
     infof(conn->data, "SFTP %p state change from %s to %s\n",
           (void *)sshc, names[sshc->state], names[nowstate]);