KeyStore.java (getInstance): Fix comment and throw IllegalArgumentException if given provider is null.

2002-11-18  Joerg Brunsmann  <joerg_brunsmann@yahoo.de>

	* java/security/KeyStore.java (getInstance): Fix
	comment and throw IllegalArgumentException if
	given provider is null.
	(getInstance): New method for jdk1.4 compatibility.

From-SVN: r59226