[patch gas]: Build failure for win32 targets

[Kai Tietz]

Hi,

I noticed in gas an new warning about an possible uninitialized
variable, which break build.

ChangeLog

2009-07-15  Kai Tietz  <kai.tietz@onevision.com>

	* listing.c (print_source): Initialize cache by NULL.

Tested patch for i686-w64-mingw32 and x86_64-w64-mingw32.

Ok for apply?

Cheers,
Kai
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