Fix build warnings.

Fixes warnings like these:

  warning: ‘add_db_op_entry’ defined but not used

Signed-off-by: Geoff Levand <geoff@infradead.org>
diff --git a/lib/flash-db.c b/lib/flash-db.c
index b6591c0..9bdc01d 100644
--- a/lib/flash-db.c
+++ b/lib/flash-db.c
@@ -113,7 +113,7 @@
  * enumerate_64 - Helper to find and operate on 64 bit entries.
  */
 
-static int enumerate_64(struct os_area_db *db,
+static int __attribute__((unused)) enumerate_64(struct os_area_db *db,
 	const struct os_area_db_id *id,
 	int (*fn)(void *inst, struct index *idx, uint64_t *value),
 	void *inst)
diff --git a/ps3-flash-util.c b/ps3-flash-util.c
index 480500d..8ae2af7 100644
--- a/ps3-flash-util.c
+++ b/ps3-flash-util.c
@@ -349,7 +349,7 @@
 	return 0;
 }
 
-static int add_db_op_entry(enum db_op_type type, enum os_area_db_owner owner,
+static int __attribute__((unused)) add_db_op_entry(enum db_op_type type, enum os_area_db_owner owner,
 	enum os_area_db_key key, const char *optarg, struct db_op_entry** list)
 {
 	int result;