When the actual offset between link and runtime address is zero, there
is no need for patching up U-Boot early when running with
CONFIG_POSITION_INDEPENDENT.
Skip the whole routine when the distance is 0.
This helps when U-Boot is loaded into ROM, or in otherwise sensitive
memory locations.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
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