After reading through the source code, I noticed leptonica actually returns null pointers to indicate errors, so we should return
a Result instead to keep the semantic consistent.
Also bumps version for leptonica-sys and fixes clippy error in master head.
After reading through the source code, I noticed leptonica actually returns null pointers to indicate errors, so we should return a Result instead to keep the semantic consistent.
Also bumps version for leptonica-sys and fixes clippy error in master head.