arm: a37xx: pci: Optimize a3700_fdt_fix_pcie_regions() when fixup offset is zero

If fixup offset is zero then there is nothing to fix. All calculation in
this case just increase addresses by value zero which results in identity.
So in this case skip whole fixup re-calculation as it is not needed.

This is just an optimization for special case when fix_offset is zero which
skips code path which does only identity operations (meaning nothing). No
functional changes.
Signed-off-by: NPali Rohár <pali@kernel.org>
Reviewed-by: NKonstantin Porotchkin <kostap@marvell.com>
Reviewed-by: NStefan Roese <sr@denx.de>

arch/arm/mach-mvebu/armada3700/cpu.c

@@ -331,6 +331,10 @@ int a3700_fdt_fix_pcie_regions(void *blob)
 	/* Calculate fixup offset from first child address (in last cell) */
 	fix_offset = base - fdt32_to_cpu(ranges[2]);
 
+	/* If fixup offset is zero then there is nothing to fix */
+	if (!fix_offset)
+		return 0;
+
 	/*
 	 * Fix address (last cell) of each child address and each parent
 	 * address