Fix c377711:Simplify read-stdin.cc.
Fix c377711:Simplify read-stdin.cc.

  ____    _    __  __ __  __ ___ _____      _    _  _____ __  __
 |  _ \  / \  |  \/  |  \/  |_ _|_   _|    / \  | |/ /_ _|  \/  |
 | | | |/ _ \ | |\/| | |\/| || |  | |     / _ \ | ' / | || |\/| |
 | |_| / ___ \| |  | | |  | || |  | |    / ___ \| . \ | || |  | |
 |____/_/   \_\_|  |_|_|  |_|___| |_|   /_/   \_\_|\_\___|_|  |_|

	* lib/libport/read-stdin.cc: Do not construct a std::string with
	0.

aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport