powerpc/mm: Switch from __FUNCTION__ to __func__

__FUNCTION__ exists only for backwards compatibility reasons with old
gcc versions. Replace it with __func__.

Signed-off-by: Dwaipayan Ray <dwaipayanray1@gmail.com>
[chleroy: Fixed parenthesis alignment]
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210711084536.95394-1-dwaipayanray1@gmail.com

arch/powerpc/mm/numa.c

@@ -1457,8 +1457,7 @@ int find_and_online_cpu_nid(int cpu)
 #endif
 	}
 
-	pr_debug("%s:%d cpu %d nid %d\n", __FUNCTION__, __LINE__,
-		cpu, new_nid);
+	pr_debug("%s:%d cpu %d nid %d\n", __func__, __LINE__, cpu, new_nid);
 	return new_nid;
 }