8000330: (fc) FileChannel.truncate issues when given size > file size

[Jeff Hain]

>The webrev with the proposed changes is here:

>
>http://cr.openjdk.java.net/~alanb/8000330+8002180/webrev/

position0(fd, p) is called even if position didn't change
(was already the case before).

Also the exception message could be "Negative size"
for homogeneity with map method.

-Jeff
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