directory_reader_posix: more verbosity in PLOG
directory_reader_posix: more verbosity in PLOG

Bug: chromium:949321
Change-Id: I0c73d730ede912a7be0b22ea3ab384a8fda2e528
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/1564512
Reviewed-by: Joshua Peraza <f5809a5e35ec7e1bd0e25cb0a0b68bb433cf6f17@chromium.org>
Reviewed-by: Mark Mentovai <f1b5a91d4d6ad523f2610114591c007e75d15084@chromium.org>
Commit-Queue: Egor Pasko <df62a37785f4466543d38b606e2821f2cbc99423@chromium.org>

chromium/crashpad,chromium/crashpad,chromium/crashpad