Use cast to avoid comparison between signed & unsigned.
treec933710abaf0c3c1153dc89f814bf4d45b27d8c1
-rw-r--r-- 6 .gitignore
-rw-r--r-- 843 CHANGES.md
-rw-r--r-- 472 Makefile
-rw-r--r-- 2996 README.md
-rw-r--r-- 1486 config.h
-rw-r--r-- 5977 rover.1
-rw-r--r-- 36507 rover.c
-rwxr-xr-x 362 rover.sh