Updates the error message in GetFileSystemType to match the function's casing and exports the error.
Updates the error message in GetFileSystemType to match the function's
casing and exports the error.

Signed-off-by: Eric Hotinger <4299aed05c15b57ae6e86ddefd3c27bcefaf04e0@gmail.com>

Microsoft/go-winio,microsoft/go-winio