x86/mm: Mark setup_emu2phys_nid() static

Make function static because it is used only in this file.
Signed-off-by: NBenjamin Thiel <b.thiel@posteo.de>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200326135842.3875-1-b.thiel@posteo.de

arch/x86/mm/numa_emulation.c

@@ -324,7 +324,7 @@ static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
 			0, NULL, NUMA_NO_NODE);
 }
 
-int __init setup_emu2phys_nid(int *dfl_phys_nid)
+static int __init setup_emu2phys_nid(int *dfl_phys_nid)
 {
 	int i, max_emu_nid = 0;