refactor(x/bank): Simplify the return (backport #21602) (#21604)

Co-authored-by: fx0x55 <80245546+fx0x55@users.noreply.github.com>

x/bank/keeper/keeper.go

@@ -150,20 +150,15 @@ func (k BaseKeeper) DelegateCoins(ctx context.Context, delegatorAddr, moduleAccA
 	if err != nil {
 		return err
 	}
-	if err := k.EventService.EventManager(ctx).EmitKV(
+	if err = k.EventService.EventManager(ctx).EmitKV(
 		types.EventTypeCoinSpent,
 		event.NewAttribute(types.AttributeKeySpender, delAddrStr),
 		event.NewAttribute(sdk.AttributeKeyAmount, amt.String()),
 	); err != nil {
 		return err
 	}
 
-	err = k.addCoins(ctx, moduleAccAddr, amt)
-	if err != nil {
-		return err
-	}
-
-	return nil
+	return k.addCoins(ctx, moduleAccAddr, amt)
 }
 
 // UndelegateCoins performs undelegation by crediting amt coins to an account with
@@ -181,21 +176,15 @@ func (k BaseKeeper) UndelegateCoins(ctx context.Context, moduleAccAddr, delegato
 		return errorsmod.Wrap(sdkerrors.ErrInvalidCoins, amt.String())
 	}
 
-	err := k.subUnlockedCoins(ctx, moduleAccAddr, amt)
-	if err != nil {
+	if err := k.subUnlockedCoins(ctx, moduleAccAddr, amt); err != nil {
 		return err
 	}
 
 	if err := k.trackUndelegation(ctx, delegatorAddr, amt); err != nil {
 		return errorsmod.Wrap(err, "failed to track undelegation")
 	}
 
-	err = k.addCoins(ctx, delegatorAddr, amt)
-	if err != nil {
-		return err
-	}
-
-	return nil
+	return k.addCoins(ctx, delegatorAddr, amt)
 }
 
 // GetSupply retrieves the Supply from store