patch 8.0.1064: Coverity warns for leaking resource

Problem:    Coverity warns for leaking resource.
Solution:   Free pty_master_fd on failure.

Author: brammool

src/os_unix.c

@@ -5692,7 +5692,10 @@ mch_create_pty_channel(job_T *job, jobopt_T *options)
 
     channel = add_channel();
     if (channel == NULL)
+    {
+	close(pty_master_fd);
 	return FAIL;
+    }
     job->jv_channel = channel;  /* ch_refcount was set by add_channel() */
     channel->ch_keep_open = TRUE;
 

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1064,
 /**/
     1063,
 /**/