[File] Regression in ppm dimension determination

[Christoph Biedl]

Christos Zoulas wrote...

> Ouch, yes. Let me see what I can do... I re-opened PR-304.

Sorry to bother you, seems the fix didn't help: Build fails since the
recently added tests:

| (...)
| Running test: ../tests/pnm1
| TZ=UTC MAGIC=../magic/magic ./test -e ../tests/pnm1.testfile
| ../tests/pnm1.result
| test: ERROR: result was (len 54)
| Netpbm image data, size = 2 x 255, greymap, ASCII text
| expected (len 53)
| Netpbm image data, size = 2 x 2, greymap, ASCII text
| ../tests/pnm1.testfile: Netpbm image data, size = 2 x 255, greymap,
| ASCII text
| make[2]: *** [Makefile:757: check-local] Error 1

    Christoph