[FAB-4766] No need to print nil error

Removes err variable from logs printout in case on nil.

Change-Id: I3e582dc4a6d6973d69ffdfbfc657c517add61dd9
Signed-off-by: Artem Barger <bartem@il.ibm.com>

core/chaincode/chaincode_support.go

@@ -589,7 +589,7 @@ func (chaincodeSupport *ChaincodeSupport) Launch(context context.Context, cccid
 				}
 
 				cds = ccpack.GetDepSpec()
-				chaincodeLogger.Debugf("launchAndWaitForRegister fetched %d from file system", len(cds.CodePackage), err)
+				chaincodeLogger.Debugf("launchAndWaitForRegister fetched %d bytes from file system", len(cds.CodePackage))
 			}
 		}