Fix if.

setup.sh

@@ -16,7 +16,7 @@ fi
 git submodule update --init --recursive
 
 # Use alias for installing packages so we don't maintain several dependency lists.
-if [[ ! -f .bash_aliases ]]; then
+if ! [[ -f .bash_aliases ]]; then
   fatal "Failed to locate .bash_aliases in path: $(pwd)" 3
 fi
 . .bash_aliases