Squashed 'littlefs/' changes from c2283a2..9843402

9843402 Fixed incorrect return value from lfs_file_seek
273cb7c Fixed problem with lookaheads larger than block device
d9367e0 Fixed collection of multiblock directories
a83b2fe Added checks for out-of-bound seeks
a8fa5e6 Fixed some corner cases with paths
26dd49a Fixed issue with negative modulo with unaligned lookaheads
0982020 Fixed issue with cold-write after seek to block boundary

git-subtree-dir: littlefs
git-subtree-split: 9843402

Author: geky

.travis.yml

@@ -9,6 +9,10 @@ script:
         -include stdio.h -Werror' make all size
 
     # run tests
-    - CFLAGS="-DLFS_READ_SIZE=16  -DLFS_PROG_SIZE=16"  make test
+    - make test
+
+    # run tests with a few different configurations
     - CFLAGS="-DLFS_READ_SIZE=1   -DLFS_PROG_SIZE=1"   make test
     - CFLAGS="-DLFS_READ_SIZE=512 -DLFS_PROG_SIZE=512" make test
+    - CFLAGS="-DLFS_BLOCK_COUNT=1023" make test
+    - CFLAGS="-DLFS_LOOKAHEAD=2047"   make test