drivers: block: Mark functions as static in drbd_receiver.c

Mark functions conn_wait_active_ee_empty() and
drbd_crypto_alloc_digest_safe() as static in drbd/drbd_receiver.c
because they are not used outside this file.

This eliminates the following warning in drbd/drbd_receiver.c:
drivers/block/drbd/drbd_receiver.c:1401:6: warning: no previous prototype for ‘conn_wait_active_ee_empty’ [-Wmissing-prototypes]
drivers/block/drbd/drbd_receiver.c:3259:21: warning: no previous prototype for ‘drbd_crypto_alloc_digest_safe’ [-Wmissing-prototypes]
Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>

drivers/block/drbd/drbd_receiver.c

@@ -1398,7 +1398,7 @@ static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev,
 		wake_up(&mdev->misc_wait);
 }
 
-void conn_wait_active_ee_empty(struct drbd_tconn *tconn)
+static void conn_wait_active_ee_empty(struct drbd_tconn *tconn)
 {
 	struct drbd_conf *mdev;
 	int vnr;
@@ -3257,6 +3257,7 @@ static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi)
  * return: NULL (alg name was "")
  *         ERR_PTR(error) if something goes wrong
  *         or the crypto hash ptr, if it worked out ok. */
+static
 struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev,
 		const char *alg, const char *name)
 {