[ARM] omap: i2c: remove conditional ick clocks

By providing a dummy ick for OMAP1510 and OMAP310, we avoid having
SoC conditional clock information in i2c-omap.c.  Also, fix the
error handling by making sure we propagate the error returned via
clk_get().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-omap1/clock.c b/arch/arm/mach-omap1/clock.c
index 382e09a..d2c6139 100644
--- a/arch/arm/mach-omap1/clock.c
+++ b/arch/arm/mach-omap1/clock.c
@@ -132,6 +132,7 @@
 	CLK(NULL,	"mpu",		&virtual_ck_mpu, CK_16XX | CK_1510 | CK_310),
 	CLK("i2c_omap.1", "fck",	&i2c_fck,	CK_16XX | CK_1510 | CK_310),
 	CLK("i2c_omap.1", "ick",	&i2c_ick,	CK_16XX),
+	CLK("i2c_omap.1", "ick",	&dummy_ck,	CK_1510 | CK_310),
 	CLK("omap-mcbsp.1", "ick",	&dspper_ck,	CK_16XX),
 	CLK("omap-mcbsp.1", "ick",	&dummy_ck,	CK_1510 | CK_310),
 	CLK("omap-mcbsp.2", "ick",	&armper_ck.clk,	CK_16XX),