riscv: remove unreachable !HAVE_FUNCTION_GRAPH_RET_ADDR_PTR code

HAVE_FUNCTION_GRAPH_RET_ADDR_PTR is always defined for RISC-V.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
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Christoph Hellwig 2019-04-15 11:14:39 +02:00 • committed by Palmer Dabbelt
commit 877425424d
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