Fix some memory leak warnings

Fixes #1215

Author: ChrisLane

src/main/java/com/flansmod/common/network/PacketMechaControl.java

@@ -47,6 +47,8 @@ public void decodeInto(ChannelHandlerContext ctx, ByteBuf data)
 		legSwing = data.readFloat();
 		leftStack = ByteBufUtils.readItemStack(data);
 		rightStack = ByteBufUtils.readItemStack(data);
+		
+		data.release();
 	}
 
 	@Override

src/main/java/com/flansmod/common/network/PacketPlaneControl.java

@@ -40,6 +40,8 @@ public void decodeInto(ChannelHandlerContext ctx, ByteBuf data)
 		gear = data.readBoolean();
 		doors = data.readBoolean();
 		wings = data.readBoolean();
+		
+		data.release();
 	}
 
 	@Override

src/main/java/com/flansmod/common/network/PacketSeatUpdates.java

@@ -45,6 +45,8 @@ public void decodeInto(ChannelHandlerContext ctx, ByteBuf data)
 		seatId = data.readInt();
 		yaw = data.readFloat();
 		pitch = data.readFloat();
+		
+		data.release();
 	}
 
 	@Override

src/main/java/com/flansmod/common/network/PacketTeamInfo.java

@@ -289,6 +289,10 @@ public void decodeInto(ChannelHandlerContext ctx, ByteBuf data)
 			FlansMod.log.throwing(e);
 			teamData = new TeamData[]{new TeamData()};
 		}
+		finally
+		{
+			data.release();
+		}
 	}
 
 	@Override

src/main/java/com/flansmod/common/network/PacketVehicleControl.java

@@ -34,6 +34,8 @@ public void decodeInto(ChannelHandlerContext ctx, ByteBuf data)
 	{
 		super.decodeInto(ctx, data);
 		doors = data.readBoolean();
+		
+		data.release();
 	}
 
 	@Override