[Bug regex/17069] leak in regcomp

["konstantin.s.serebryany at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17069

--- Comment #3 from Kostya Serebryany <konstantin.s.serebryany at gmail dot com> ---
Created attachment 7651
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7651&action=edit
larger pattern

The leak on original reproducer is gone, 
however on a larger pattern (attached) a very similar looking 
leak is still present:

Direct leak of 192 byte(s) in 6 object(s) allocated from:
    #0 0x494a39 in calloc
/home/kcc/llvm/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:95
    #1 0x7f3f2ed1c14b in parse_bracket_exp glibc-trunk/posix/regcomp.c:3052
    #2 0x7f3f2ed1c14b in parse_expression glibc-trunk/posix/regcomp.c:2265
    #3 0x7f3f2ed1d48f in parse_branch glibc-trunk/posix/regcomp.c:2193
    #4 0x7f3f2ed1d57d in parse_reg_exp glibc-trunk/posix/regcomp.c:2145
    #5 0x7f3f2ed1d9c8 in parse glibc-trunk/posix/regcomp.c:2114
    #6 0x7f3f2ed1d9c8 in re_compile_internal glibc-trunk/posix/regcomp.c:794
    #7 0x7f3f2ed1ec10 in __regcomp glibc-trunk/posix/regcomp.c:501
    #8 0x4b3338 in main (/home/kcc/tmp/a.out+0x4b3338)

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