Don't bother paying 0 rent

runtime/src/bank.rs

@@ -2676,6 +2676,7 @@ impl Bank {
                 } else {
                     rent_share
                 };
+                if rent_to_be_paid > 0 {
                     let mut account = self.get_account(&pubkey).unwrap_or_default();
                     account.lamports += rent_to_be_paid;
                     self.store_account(&pubkey, &account);
@@ -2687,6 +2688,7 @@ impl Bank {
                             post_balance: account.lamports,
                         },
                     ));
+                }
             });
         self.rewards.write().unwrap().append(&mut rewards);