cabinet: Check buffer size before copying in NONEfdi_decomp.

[Rob Shearman]

Check that the data will fit into the fixed sized buffer CAB(outbuf)
and return an error if not before copying.
---
 dlls/cabinet/fdi.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

Fixes an off-by-one error in the previous version of this patch that
caused the tests to fail.
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