[gdb] Fix heap-buffer-overflow in completion_tracker::build_completion_result

[gdb] Fix heap-buffer-overflow in completion_tracker::build_completion_result

When building gdb with address sanitizer and running test-case
gdb.base/completion.exp, we run into:
...
==5743==ERROR: AddressSanitizer: heap-buffer-overflow on address \
  0x60200025c02f at pc 0x000000cd9d64 bp 0x7fff3297da30 sp 0x7fff3297da28
READ of size 1 at 0x60200025c02f thread T0
    #0 0xcd9d63 in completion_tracker::build_completion_result(char const*, \
                     int, int) gdb/completer.c:2258
  ...
0x60200025c02f is located 1 bytes to the left of 1-byte region \
  [0x60200025c030,0x60200025c031)
...

This can be reproduced using just:
...
$ gdb
(gdb) p/d[TAB]
...

The problem is in this code in completion_tracker::build_completion_result:
...
      bool completion_suppress_append
        = (suppress_append_ws ()
           || match_list[0][strlen (match_list[0]) - 1] == ' ');
...
If strlen (match_list[0]) == 0, then we access match_list[0][-1].

Fix this by testing if the memory access is in bounds before doing the memory
access.

Tested on x86_64-linux.

gdb/ChangeLog:

2020-12-04  Tom de Vries  <tdevries@suse.de>

	PR gdb/27003
	* completer.c (completion_tracker::build_completion_result): Don't
	access match_list[0][-1].