gdi32 (2/2): fix unchecked NULL ptr in BIDI_Reorder

[Alexander Dorofeyev]

3rd try. In this version I don't create a temp buffer, instead pass the original
string to subroutines; in BidiLines an additional parameter had to be added, to
indicate that the original string has been passed and in-place modifications it
normally does on the buffer must be skipped.

Alexandre Julliard wrote:
    > You shouldn't need to allocate a new buffer, the output modifications
    > should be skipped when no output string is requested.


---
       dlls/gdi32/bidi.c |   19 ++++++++++++-------
       1 files changed, 12 insertions(+), 7 deletions(-)





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