Allow format script to be run from anywhere

Summary: Previously format script had to be run from the root directory. With this change it can be run from anywhere

Reviewed By: lucasr

Differential Revision: D3715186

fbshipit-source-id: a46bc0b49aa32f0860bb3e3097ae7b08bdccbf2e

format.sh

@@ -27,4 +27,4 @@ clang-format \
     SpaceAfterCStyleCast: true, \
     UseTab: Never, \
   }" "$@" \
-  -i ./**/*.{h,c,cpp}
+  -i $(dirname $0)/**/*.{h,c,cpp}