Review Request - JDK-7194370 (fs) WatchService fails if volume S/N is 0 [win]

[Dan Xu]

Hi folks,

Please help review the fix for JDK-7194370,,(fs) WatchService fails if 
volume S/N is 0 [win]. The webrev is uploaded at, 
http://cr.openjdk.java.net/~dxu/7194370/webrev/.

The issue is because we have an assumption that volumn serial number 
cannot be 0.The serial number is 32-bit number determined by the date on 
the currentcomputer at the time of a disk's formatting. It is very rare 
for a volumnto be assigned a serial number as 0000-0000. But it could 
happen. The fix is to remove non-zero assertions.Thanks!

-Dan
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