[PATCH] ARM: OMAP: i2c-omap: Fix i2c_xfer for 1 msg

omap_i2c_xfer is supposed to return number of messages successfuly
transfered. Remove bogus condition which causes it to fail when
transfering one message.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>