media: c8sectpfe: Use resource_size function on memory resource

To adapt fei->sram_size calculation via resource_size for memory size
calculation before, in fei->sram = devm_ioremap_resource(dev, res).
And make memory initialization range in
memset_io for fei->sram appropriate
Signed-off-by: NVasyl Gomonovych <gomonovych@gmail.com>
Acked-by: NPatrice Chotard <patrice.chotard@st.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c

@@ -693,7 +693,7 @@ static int c8sectpfe_probe(struct platform_device *pdev)
 	if (IS_ERR(fei->sram))
 		return PTR_ERR(fei->sram);
 
-	fei->sram_size = res->end - res->start;
+	fei->sram_size = resource_size(res);
 
 	fei->idle_irq = platform_get_irq_byname(pdev, "c8sectpfe-idle-irq");
 	if (fei->idle_irq < 0) {