patch 7.4.1855
Problem:    Valgrind reports memory leak for job that is not freed.
Solution:   Free all jobs on exit.  Add test for failing job.
diff --git a/src/channel.c b/src/channel.c
index 94681ee..2cc46fe 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -1285,6 +1285,7 @@
     int	    len = (int)STRLEN(line);
     char_u  *p;
 
+    /* Need to make a copy to be able to append a NL. */
     if ((p = alloc(len + 2)) == NULL)
 	return;
     STRCPY(p, line);
@@ -2888,7 +2889,7 @@
 /*
  * Read from channel "channel" for as long as there is something to read.
  * "part" is PART_SOCK, PART_OUT or PART_ERR.
- * The data is put in the read queue.
+ * The data is put in the read queue.  No callbacks are invoked here.
  */
     static void
 channel_read(channel_T *channel, int part, char *func)
@@ -4184,6 +4185,15 @@
     }
 }
 
+#if defined(EXITFREE) || defined(PROTO)
+    void
+job_free_all(void)
+{
+    while (first_job != NULL)
+	job_free(first_job);
+}
+#endif
+
 /*
  * Return TRUE if the job should not be freed yet.  Do not free the job when
  * it has not ended yet and there is a "stoponexit" flag, an exit callback