file: fixed off-by-one errors

The file magic scanning tool/library was updated to fix a off-by-one error in the
last security fixes.

Fixed bugs
bnc#866750
CVE-2014-2270: file: crash when parsing some PE executables
CVE-CVE-2014-2270
CVE-2014-2270: file: crash when parsing some PE executables
Selected Binaries
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