gofrontend: correct file reading logic in Stream_from_file
The implementation of Stream_from_file mishandled several cases:
* It reversed the check for whether bytes were already available in
the peek buffer.
* It considered positive return values from lseek to be an error, when
only a -1 return value indicates an error.
Change-Id: Ic699d3ff7fe589f5ca2362b3db2971a6b9dc9022
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/259437
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Cherry Zhang <cherryyz@google.com>
1 file changed
