dwrite: initialize realloc'ed memory to zero

[Aric Stewart]

in the loaders and file_loaders we depend on unused slots being zero
so explicitly initialize that during realloc

Fixes exceptions when run with +heap
---
 dlls/dwrite/dwrite_private.h | 5 +++++
 dlls/dwrite/main.c           | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)


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