[10] RFR 8185934: keytool shows "Signature algorithm: SHA1withECDSA, -1-bit key"

[Weijun Wang]

Please review this trivial fix at

   http://cr.openjdk.java.net/~weijun/8185934/webrev.00/

KeyUtil.getSize() are also called elsewhere when they key is weak, where key 
length is not -1.

Noreg-trivial.

Thanks
Max