sh: dwarf: Make dwarf_lookup_fde() static

arch/sh/kernel/dwarf.c:347:19: warning: no previous prototype for 'dwarf_lookup_fde' [-Wmissing-prototypes]

There are no users outside this file, so make it static.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: John Paul Adrian Glaubitz <[e-mail]>
Link: https://lore.kernel.org/r/55e82[e-mail]
Signed-off-by: John Paul Adrian Glaubitz <[e-mail]>

arch/sh/kernel/dwarf.c

···
  *	dwarf_lookup_fde - locate the FDE that covers pc
  *	@pc: the program counter
  */
-struct dwarf_fde *dwarf_lookup_fde(unsigned long pc)
+static struct dwarf_fde *dwarf_lookup_fde(unsigned long pc)
 {
 	struct rb_node **rb_node = &fde_root.rb_node;
 	struct dwarf_fde *fde = NULL;