v2.4.2

Code size	Code size (readonly)	Code size (threadsafe)	Code size (migrate)	Code size (error-asserts)	Coverage
14592 B (-0.1%)	5634 B (+0.9%)	15414 B (-0.1%)	16288 B (-0.0%)	15204 B	94.7% of 1758 lines (+0.0%)

9c7e232 Fixed missing definition of lfs_cache_drop in readonly mode
03f088b Tweaked lfs_file_flush to still flush caches when build under LFS_READONLY
e955b9f Fix lfs_file_seek doesn't update cache properties correctly in readonly mode. Invalidate cache to fix it.
1363c9f fix bug:lfs_alloc will alloc one block repeatedly in multiple split
5bc682a Typo
1877c40 Indent sub-portions of tag fields
e29e7ae Specify unit of the size members of the lfs_config struct
4977fa0 Fix spelling errors
fdda3b4 Always zero rambd buffer before first use
fb2c311 Fix compiler warnings when LFS_READONLY defined