i2c: jz4780: drop superfluous init

commit 27bfeb5a0619554d9734fb39e14f0e80fa7c342c upstream.

David reported that the length for memset was incorrect (element sizes
were not taken into account). Then I saw that we are clearing kzalloced
memory, so we can simply drop this code.

Reported-by: David Binderman <dcb314@hotmail.com>
Reviewed-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>