Fix two crashes related to kshdb (#82)

This commit fixes two different crashes related to kshdb:
- When redirect is given an invalid file descriptor, a segfault
  no longer occurs. Reproducer:
  $ ksh -c 'redirect 9>&200000000000'

- Fix a crash due to free(3) being used on an invalid pointer.
  This can be reproduced with kshdb (commands from att/ast#582):
  $ git clone https://github.com/rocky/kshdb.git
  $ cd kshdb
  $ ksh autogen.sh
  $ echo "print hi there" > $HOME/.kshdbrc
  $ ./kshdb -L . test/example/dbg-test1.sh

src/cmd/ksh93/bltins/misc.c: b_dot_cmd():
- The string pointed to by shp->st.filename must be able to be
  freed from memory with free(3), so duplicate the string with
  strdup(3).

src/cmd/ksh93/sh/io.c: sh_redirect():
- Show an error message when a file descriptor is invalid to
  fix a memory fault.

NEWS

@@ -3,6 +3,13 @@ For full details, see the git log at: https://github.com/ksh93/ksh
 
 Any uppercase BUG_* names are modernish shell bug IDs.
 
+2020-07-19:
+
+- Fixed a crash that occured in the '.' command when using kshdb.
+
+- Fixed a crash that occured when attempting to use redirection with an
+  invalid file descriptor.
+
 2020-07-16:
 
 - The 'history' and 'r' default aliases have been made regular built-ins,