i2c-omap: Fix NULL pointer dereferencing

This patch fixes bug #9581 reported by Marcio Buss. If kzalloc fails,
omap_i2c_write_reg() tries to reset an unallocated I2C controller.

Cc: Marcio Buss <[e-mail]>
Signed-off-by: Tony Lindgren <[e-mail]>
Signed-off-by: Jean Delvare <[e-mail]>

drivers/i2c/busses/i2c-omap.c

···
 err_free_irq:
 	free_irq(dev->irq, dev);
 err_unuse_clocks:
+	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
 	omap_i2c_disable_clocks(dev);
 	omap_i2c_put_clocks(dev);
 err_free_mem:
 	platform_set_drvdata(pdev, NULL);
 	kfree(dev);
 err_release_region:
-	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
 	release_mem_region(mem->start, (mem->end - mem->start) + 1);
 
 	return r;