readdir: use arg name dir instead of path

base/file.jl

@@ -691,15 +691,14 @@ julia> readdir("/home/JuliaUser/Projects/julia")
  "usr-staging"
 ```
 """
-function readdir(path::AbstractString)
+function readdir(dir::AbstractString)
     # Allocate space for uv_fs_t struct
     uv_readdir_req = zeros(UInt8, ccall(:jl_sizeof_uv_fs_t, Int32, ()))
 
     # defined in sys.c, to call uv_fs_readdir, which sets errno on error.
     err = ccall(:uv_fs_scandir, Int32, (Ptr{Cvoid}, Ptr{UInt8}, Cstring, Cint, Ptr{Cvoid}),
-                C_NULL, uv_readdir_req, path, 0, C_NULL)
-    err < 0 && throw(SystemError("unable to read directory $path", -err))
-    #uv_error("unable to read directory $path", err)
+                C_NULL, uv_readdir_req, dir, 0, C_NULL)
+    err < 0 && throw(SystemError("unable to read directory $dir", -err))
 
     # iterate the listing into entries
     entries = String[]