Replace all occurrences of `(exit N); exit' with

`(exit N); exit N'.  Otherwise, those many tests could exit with
improper exit status when exiting via e.g., a trapped interrupt.
Thanks to a report from Bob Proulx.

tests/input-tty

@@ -6,5 +6,5 @@ if test "$have_input_tty" = no; then
   echo "$0: This test must have a controlling input \`terminal'," 1>&2
   echo "  so it may not be run via \`batch', \`at', or \`rsh'." 1>&2
   echo "  On some systems, it may not even be run in the background." 1>&2
-  (exit 77; exit); exit
+  (exit 77); exit 77
 fi