libssh: remove dead code in sftp_qoute

... by removing a superfluous NULL pointer check that also confuses
Coverity.

Fixes #2143
Closes #2153

lib/ssh-libssh.c

@@ -2516,7 +2516,7 @@ static void sftp_quote(struct connectdata *conn)
       state(conn, SSH_SFTP_NEXT_QUOTE);
     return;
   }
-  if(cmd) {
+
   /*
    * the arguments following the command must be separated from the
    * command with a space so we can check for it unconditionally
@@ -2642,12 +2642,6 @@ static void sftp_quote(struct connectdata *conn)
   state(conn, SSH_SFTP_CLOSE);
   sshc->nextstate = SSH_NO_STATE;
   sshc->actualcode = CURLE_QUOTE_ERROR;
-    return;
-  }
-
-  if(!sshc->quote_item) {
-    state(conn, SSH_SFTP_GETINFO);
-  }
 }
 
 static void sftp_quote_stat(struct connectdata *conn)