[PATCH] ptx: avoid new warning/error from upcoming gcc-7.x

[Jim Meyering]

I noticed a new warning/error when building with gcc-built-from-git.
Here's the fix:

ptx: avoid new warning/error from upcoming gcc-7.x

* src/ptx.c (fix_output_parameters): Switch to an unsigned type that
matches the OCCURS.file_index type. This avoids the following error
from gcc-7.0.0 20160829 (experimental):
  src/ptx.c:1220:14: error: assuming signed overflow does not occur \
    when simplifying conditional to constant [-Werror=strict-overflow]
          if (file_index > 0)

ptx-vs-gcc-git.diff
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