Fix more issues discovered by luacheck

.tests/luacheckrc

@@ -2,11 +2,17 @@ quiet = 1
 codes = true
 
 exclude_files = {
-	".luarocks/*"
+	".luarocks/*",
+	"worldeditadditions/utils/bit.lua"
 }
 
 
-ignore = {"631", "61[124]", "412", "21[123]"}
+ignore = {
+	"631", "61[124]",
+	"412",
+	"321/bit",
+	"21[123]"
+}
 
 -- Read-write globals (i.e. they can be defined)
 globals = {

worldeditadditions/utils/format/human_size.lua

@@ -5,7 +5,7 @@
 -- @param	decimals	number	The number of decimal places to show.
 -- @return	string		A formatted string that represents the given input number.
 function worldeditadditions.format.human_size(n, decimals)
-	sizes = { "", "K", "M", "G", "T", "P", "E", "Y", "Z" }
+	local sizes = { "", "K", "M", "G", "T", "P", "E", "Y", "Z" }
 	local factor = math.floor((#tostring(n) - 1) / 3)
 	local multiplier = 10^(decimals or 0)
 	local result = math.floor(0.5 + (n / math.pow(1000, factor)) * multiplier) / multiplier