win32: deduplicate code: use p_open in p_creat

Signed-off-by: Sven Strickroth <email@cs-ware.de>

src/win32/posix_w32.c

@@ -520,14 +520,7 @@ int p_open(const char *path, int flags, ...)
 
 int p_creat(const char *path, mode_t mode)
 {
-	git_win32_path buf;
-
-	if (git_win32_path_from_utf8(buf, path) < 0)
-		return -1;
-
-	return _wopen(buf,
-		_O_WRONLY | _O_CREAT | _O_TRUNC | STANDARD_OPEN_FLAGS,
-		mode & WIN32_MODE_MASK);
+	return p_open(path, O_WRONLY | O_CREAT | O_TRUNC, mode);
 }
 
 int p_getcwd(char *buffer_out, size_t size)