fix potential invalid mmap call and uninitialized file size #4559
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Fixes a warning from Clang 21 (unix.StdCLibraryFunctions) where mmap() could be called with a length of 0 if the dictionary file is empty. Mapping a zero-length range is undefined behavior under POSIX. - Added guard for zero-length dictionary files.
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Fixes a warning from Clang 21 (unix.StdCLibraryFunctions) where mmap() could be called with a length of 0 if the dictionary file is empty. Mapping a zero-length range is undefined behavior under POSIX.
Reported-by: Clang 21 Static Analyzer