i2c: Use resource_size macro

This replace all instances in the i2c busses tree of
res->end - res->start + 1 with the handy macro resource_size(res)
from ioport.h (coming in from platform_device.h).

This was created with a simple
sed -i -e 's/\([a-z]*\)->end *- *[a-z]*->start *+ *1/resource_size(\1)/g'

Then manually replacing the PXA redefiniton of the same kind
of macro manually. Recompiled some ARM defconfigs I could find to
make a rough test so it shouldn't break anything, though I
couldn't see exactly which configs you need for all the drivers.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

drivers/i2c/busses/i2c-bfin-twi.c

@@ -652,7 +652,7 @@ static int i2c_bfin_twi_probe(struct platform_device *pdev)
 		goto out_error_get_res;
 	}
 
-	iface->regs_base = ioremap(res->start, res->end - res->start + 1);
+	iface->regs_base = ioremap(res->start, resource_size(res));
 	if (iface->regs_base == NULL) {
 		dev_err(&pdev->dev, "Cannot map IO\n");
 		rc = -ENXIO;