If we get EOF earlier than expected, the current read loops will
deadlock. This may easily happen if the disk cache gets corrupted.
Fix it by using a helper function that handles EOF.
Steps to reproduce (on a build with asserts disabled):
$ glxgears
$ find ~/.cache/mesa/ -type f -exec truncate -s 0 '{}' \;
$ glxgears # deadlock
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
b9e92334f7