Staging: goldfish: use __func__ instead of embedded function names

Embedded function names are less appropriate to use when
refactoring, can cause function renaming.  Prefer the use
of "%s", __func__ to embedded function names

Signed-off-by: Mohsin Shan <mohsinshan1k@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>