staging: r8188eu: remove unnecessary initialization to zero

staging: r8188eu: remove unnecessary initialization to zero

The initialization to zero of the variable 'len' in rtw_pktfile_read()
is not needed. It is immediately set to another value. Remove the
initialization to zero. While at it, remove an extra space.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220820181623.12497-13-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>