arch/sh/include/asm/topology.h: remove unused parent_node() macro

Commit a7be6e5a7f8d ("mm: drop useless local parameters of
__register_one_node()") removed the last user of parent_node().

The parent_node() macro in SUPERH platform is unnecessary.

Remove it for cleanup.

Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Dou Liyang <[e-mail]>
Reported-by: Michael Ellerman <[e-mail]>
Cc: Yoshinori Sato <[e-mail]>
Cc: Rich Felker <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/sh/include/asm/topology.h

···
 #ifdef CONFIG_NUMA
 
 #define cpu_to_node(cpu)	((void)(cpu),0)
-#define parent_node(node)	((void)(node),0)
 
 #define cpumask_of_node(node)	((void)node, cpu_online_mask)