msrle32: Fix uses of arithmetic operators on Boolean types in MSRLE32_CompressRLE4Line and MSRLE32_CompressRLE8Line.

[Rob Shearman]

The "extra_byte" variable is used as though it contains an integer
rather than a TRUE/FALSE value so make it into an integer.
---
 dlls/msrle32/msrle32.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
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