From: Ricardo M. Correia <Ricardo.M.Correia@Sun.COM>
Subject: [PATCH] fix error handling

Fix some incorrect error handling.

1) In vn_open(), if fstat64() returned an error, the real errno
was being obscured by calling close().

2) Add error handling for both pwrite64() calls in vn_rdwr().

Signed-off-by: Ricardo M. Correia <Ricardo.M.Correia@Sun.COM>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>