MFC r271321:

  Don't cross mount boundaries when cleaning tmp files.

Approved by:	re (gjb)
Relnotes:	yes
MFC r272028:

  Make it more explicitly clear that -t will not change filename.

Approved by:	re (gjb)
MFC r271720:

  If fgets(3) fails in getbounds(), show strerror(3) if not an EOF. Also fix a
  FILE* leak in getbounds().

PR:		192032
Approved by:	re (gjb)