net/smc: Keep smc_close_final rc during active close

net/smc: Keep smc_close_final rc during active close

When smc_close_final() returns error, the return code overwrites by
kernel_sock_shutdown() in smc_close_active(). The return code of
smc_close_final() is more important than kernel_sock_shutdown(), and it
will pass to userspace directly.

Fix it by keeping both return codes, if smc_close_final() raises an
error, return it or kernel_sock_shutdown()'s.

Link: https://lore.kernel.org/linux-s390/[email protected]/
Fixes: 606a63c9783a ("net/smc: Ensure the active closing peer first closes clcsock")
Suggested-by: Karsten Graul <[email protected]>
Signed-off-by: Tony Lu <[email protected]>
Reviewed-by: Wen Gu <[email protected]>
Acked-by: Karsten Graul <[email protected]>
Signed-off-by: David S. Miller <[email protected]>