sys_fs: Implement ENOTDIR

Utilities/File.cpp

@@ -166,6 +166,7 @@ static fs::error to_error(int e)
 	case ENOTEMPTY: return fs::error::notempty;
 	case EROFS: return fs::error::readonly;
 	case EISDIR: return fs::error::isdir;
+	case ENOTDIR: return fs::error::notdir;
 	case ENOSPC: return fs::error::nospace;
 	case EXDEV: return fs::error::xdev;
 	default: return fs::error::unknown;
@@ -2833,6 +2834,7 @@ void fmt_class_string<fs::error>::format(std::string& out, u64 arg)
 		case fs::error::notempty: return "Not empty";
 		case fs::error::readonly: return "Read only";
 		case fs::error::isdir: return "Is a directory";
+		case fs::error::notdir: return "Not a directory";
 		case fs::error::toolong: return "Path too long";
 		case fs::error::nospace: return "Not enough space on the device";
 		case fs::error::xdev: return "Device mismatch";

Utilities/File.h

@@ -683,6 +683,7 @@ namespace fs
 		notempty,
 		readonly,
 		isdir,
+		notdir,
 		toolong,
 		nospace,
 		xdev,