Update error handling for os2 on windows

core/os/os2/temp_file_windows.odin

@@ -1,29 +1,29 @@
 //+private
 package os2
 
+import "core:runtime"
 import win32 "core:sys/windows"
 
 _create_temp :: proc(dir, pattern: string) -> (^File, Error) {
 	return nil, nil
 }
 
-_mkdir_temp :: proc(dir, pattern: string, allocator := context.allocator) -> (string, Error) {
+_mkdir_temp :: proc(dir, pattern: string, allocator: runtime.Allocator) -> (string, Error) {
 	return "", nil
 }
 
-_temp_dir :: proc(allocator := context.allocator) -> string {
-	b := make([dynamic]u16, u32(win32.MAX_PATH), context.temp_allocator)
-	for {
-		n := win32.GetTempPathW(u32(len(b)), raw_data(b))
-		if n > u32(len(b)) {
-			resize(&b, int(n))
-			continue
-		}
-		if n == 3 && b[1] == ':' && b[2] == '\\' {
-
-		} else if n > 0 && b[n-1] == '\\' {
-			n -= 1
-		}
-		return win32.utf16_to_utf8(b[:n], allocator)
+_temp_dir :: proc(allocator: runtime.Allocator) -> string {
+	n := win32.GetTempPathW(0, nil)
+	if n == 0 {
+		return ""
 	}
+	b := make([]u16, max(win32.MAX_PATH, n), _temp_allocator())
+	n = win32.GetTempPathW(u32(len(b)), raw_data(b))
+
+	if n == 3 && b[1] == ':' && b[2] == '\\' {
+
+	} else if n > 0 && b[n-1] == '\\' {
+		n -= 1
+	}
+	return win32.utf16_to_utf8(b[:n], allocator)
 }