e2image: Add an assertion/sanity check in initialize_qcow2_image()

This is mostly to shut up some coverity warnings, but in theory
fs->blocksize could have been corrupted outside of this function...

Fixes-Coverity-Bug: 1297492
Fixes-Coverity-Bug: 1297490
Fixes-Coverity-Bug: 1297488
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1 file changed