um: Declare fix_range_common as a static function

It is only used within the same file.
Signed-off-by: Benjamin Berg <benjamin@sipsolutions.net>
Signed-off-by: Richard Weinberger <richard@nod.at>

arch/um/kernel/tlb.c

@@ -314,8 +314,8 @@ static inline int update_p4d_range(pgd_t *pgd, unsigned long addr,
 	return ret;
 }
 
-void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
-		      unsigned long end_addr, int force)
+static void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
+			     unsigned long end_addr, int force)
 {
 	pgd_t *pgd;
 	struct host_vm_change hvc;