patch 8.0.0980: Coverity warning for failing to open /dev/null

Problem:    Coverity warning for failing to open /dev/null.
Solution:   When /dev/null can't be opened exit the child.

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    980,
 /**/
     979,
 /**/