radeon: Remove duplicate assignments in radeon_i2c_create
Import Linux commit cd004b3f4cd4169815c82bf9e424fda06978898a

Author: Shirish S <s.shirish@samsung.com>
Date:   Thu Aug 30 07:04:06 2012 +0000

    drm: edid: add support for E-DDC

    The current logic for probing ddc is limited to
    2 blocks (256 bytes), this patch adds support
    for the 4 block (512) data.

    To do this, a single 8-bit segment index is
    passed to the display via the I2C address 30h.
    Data from the selected segment is then immediately
    read via the regular DDC2 address using a repeated
    I2C 'START' signal.

    Signed-off-by: Shirish S <s.shirish@samsung.com>
    Reviewed-by: Jean Delvare <jdelvare@suse.de>
    Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    Reviewed-by: Ville Syrjala <ville.syrjala@linux.intel.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>