git-svn: extra error check to ensure we open a file correctly
git-svn: extra error check to ensure we open a file correctly

This may be an issue with repositories imported with commit
27a1a8014b842c0d70fdc91c68dd361ca2dfb34c or later, but before
commit dad73c0bb9f33323ec1aacf560a6263f1d85f81a.

Signed-off-by: Eric Wong <8c2951295f8292b0c03727bc4652981172298eae@yhbt.net>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git