Fix async tests

src/mariadb/protocol/deserialize.rs

@@ -31,13 +31,15 @@ impl<'a> DeContext<'a> {
 
     pub async fn next_packet(&mut self) -> Result<(), failure::Error> {
         if let Some(stream) = &mut self.stream {
-            println!("Called next packet");
             self.decoder = Decoder::new(stream.next_packet().await?);
 
-            Ok(())
-        } else {
-            failure::bail!("Calling next_packet on DeContext with no stream provided")
+            return Ok(());
+        } else if self.decoder.buf.len() > 0 {
+            // There is still data in the buffer
+            return Ok(())
         }
+
+        failure::bail!("Calling next_packet on DeContext with no stream provided")
     }
 }
 

src/mariadb/protocol/packets/binary/com_stmt_prepare_resp.rs

@@ -1,4 +1,4 @@
-use crate::mariadb::{DeContext, Deserialize, ComStmtPrepareOk, ColumnDefPacket, Capabilities, EofPacket};
+use crate::mariadb::{Framed, DeContext, Deserialize, ComStmtPrepareOk, ColumnDefPacket, Capabilities, EofPacket};
 
 #[derive(Debug, Default)]
 pub struct ComStmtPrepareResp {