ANDROID: goldfish_sync switch ksys_close() to close_fd()

In commit 1572bfdf21d4 ("file: Replace ksys_close with close_fd"),
ksys_close is removed from the kernel, as the same functionality is now
in close_fd().  So do this for incfs so that the code continues to work
properly.

Fixes: 1572bfdf21d4 ("file: Replace ksys_close with close_fd")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I6fb3464543d91d291afdd4cd7fa7a92a4897d188