[PATCH 3/3] gdi32/enhmfdrv: When blitting, don't crash if the source is NULL.

[Charles Davis]

Fixes bug 4543.
---
 dlls/gdi32/enhmfdrv/bitblt.c |  111
+++++++++++++++++++++++++++---------------
 dlls/gdi32/tests/metafile.c  |   10 +---
 2 files changed, 74 insertions(+), 47 deletions(-)



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