core: fix jaro-winkler heap-buffer-overflow

The implementation could read beyond the b string.

I encountered this crash by passing --opengl-filter=mock with an incorrect environment, but it could be reproduced with:

$ ./vlc --opaaaaaaa
…
Error: Unknown option `--opaaaaaaa'
=================================================================
==522294==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000022655 at pc 0x7f8b1793d73d bp 0x7ffe311de800 sp 0x7ffe311de7f8
READ of size 1 at 0x602000022655 thread T0
    #0 0x7f8b1793d73c in jaro_inner ../../src/config/jaro_winkler.c:111
    #1 0x7f8b1793db7a in vlc_jaro_winkler ../../src/config/jaro_winkler.c:159

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added 5 commits

• 55f95c55...f1603b69 - 3 commits from branch videolan:master
• 55995aa4 - core: fix incorrect use of ssize_t
• 52ef980f - core: fix jaro-winkler heap-buffer-overflow

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enabled an automatic merge when the pipeline for 52ef980f succeeds

merged