build-pkg: reorder functions

gitCheckout() will use gitCommit()

tools/build-pkg.lua

@@ -353,6 +353,12 @@ local function gitTag(name)
     os.execute(GIT .. 'tag ' .. name)
 end
 
+-- git commits changes in ./usr
+local function gitCommit(message)
+    local cmd = GIT .. GIT_USER .. 'commit -a -m %q --quiet'
+    assert(execute(cmd:format(message)))
+end
+
 local function gitCheckout(new_branch, deps)
     local main_dep = deps[1]
     if main_dep then
@@ -409,12 +415,6 @@ local function gitStatus()
     return new_files, changed_files
 end
 
--- git commits changes in ./usr
-local function gitCommit(message)
-    local cmd = GIT .. GIT_USER .. 'commit -a -m %q --quiet'
-    assert(execute(cmd:format(message)))
-end
-
 local function isValidBinary(target, file)
     local cmd = './usr/bin/%s-objdump -t %s > /dev/null 2>&1'
     return execute(cmd:format(target, file))