09d4133 changed blocknr_T from long to int64_t, so pe_bnum is now always 64-bit. This was an incompatible change in the swapfile format for 32-bit systems, but there have been no complaints in the past 9 years so just adjust the test.
(cherry picked from commit a1ded1b113)
Problem: Crash when recovering from corrupted swap file.
Solution: Bail out when the line index looks wrong. (closesvim/vim#12276)
bf1b713202
Co-authored-by: Bram Moolenaar <Bram@vim.org>
(cherry picked from commit 21136d49dd)