sh: dwarf unwinder needs linux/module.h.

Previously the struct module definition was pulled in from other headers,
but we want the reference to be explicit. Fixes up randconfig build
issues.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/dwarf.c b/arch/sh/kernel/dwarf.c
index 94739ee..8c09f62 100644
--- a/arch/sh/kernel/dwarf.c
+++ b/arch/sh/kernel/dwarf.c
@@ -22,6 +22,7 @@
 #include <linux/mm.h>
 #include <linux/elf.h>
 #include <linux/ftrace.h>
+#include <linux/module.h>
 #include <asm/dwarf.h>
 #include <asm/unwinder.h>
 #include <asm/sections.h>