style: fix a null-pointer dereference on successful merge #1236
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Fixes a use-after-free introduced in 3f4f035, where on successful style deduplication the loop would continue, and fail to dereference the style pointer on next iteration, leading to a segfault.
Of note, I can only reproduce this on musl, but the bug was equally present on glibc. AFAICT glibc is a bit more lax with clearing leftovers after using
free(), so it went unnoticed.