[Bug glob/20707] gl_pathv entries not set to NULL with GLOB_DOOFFS

["mike at php dot net" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20707

--- Comment #2 from Michael Wallner <mike at php dot net> ---
Hmmm, did you try and run the test program? Without the sanitizer, it's not
always observable, because the allocated memory may only contain NULs.

Here's what I get, reproducibly:

$ make -B && ./main
cc -fsanitize=address -Wall   -c -o main.o main.c
cc -lasan  main.o   -o main
ASAN:DEADLYSIGNAL
=================================================================
==6998==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc
0x7fe795439376 bp 0x7fffbc2d0a10 sp 0x7fffbc2d0168 T0)
    #0 0x7fe795439375 in strlen (/usr/lib/libc.so.6+0x80375)
    #1 0x7fe7957ad65b in unpoison_glob_t
/build/gcc/src/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:1658
    #2 0x7fe7957ae0df in __interceptor_glob
/build/gcc/src/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:1719
    #3 0x400ad5 in main (/home/mike/tmp/glob-test/main+0x400ad5)
    #4 0x7fe7953d9290 in __libc_start_main ../csu/libc-start.c:289
    #5 0x400909 in _start (/home/mike/tmp/glob-test/main+0x400909)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/usr/lib/libc.so.6+0x80375) in strlen
==6998==ABORTING

$ cat Makefile
CFLAGS ?= -fsanitize=address -Wall
LDFLAGS ?= -lasan

main: main.o

$ gcc --version
gcc (GCC) 6.2.1 20160830
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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