Fix some "signed v unsigned comparison" warnings with -Wextra
treeefd690f67a58c2ea1c3984397c2aefebd716d7ce
-rw-r--r-- 1169 .HEADER
-rw-r--r-- 69 .gitignore
-rw-r--r-- 2689 CONVENTIONS
-rw-r--r-- 18760 COPYING
-rw-r--r-- 4582 Makefile
-rw-r--r-- 493 api.doxygen
-rw-r--r-- 2704 git.git-authors
-rw-r--r-- 232 libgit2.pc.in
drwxr-xr-x - src
drwxr-xr-x - tests