Merge two logs in one

There is no need for logging the exception separately. Moreover, some
data providers (Sybase.AdoNet4.AseClient) sometimes fail when reading
the exception message, causing this way of logging to fail the whole
program.

Author: fredericDelaporte

src/NHibernate/Async/Tool/hbm2ddl/SchemaExport.cs

@@ -173,8 +173,7 @@ private async Task ExecuteInitializedAsync(Action<string> scriptAction, bool exe
 			catch (OperationCanceledException) { throw; }
 			catch (Exception e)
 			{
-				log.Warn("Unsuccessful: {0}", sql);
-				log.Warn(e, e.Message);
+				log.Warn(e, "Unsuccessful: {0}", sql);
 				if (throwOnError)
 				{
 					throw;

src/NHibernate/Tool/hbm2ddl/SchemaExport.cs

@@ -190,8 +190,7 @@ private void ExecuteInitialized(Action<string> scriptAction, bool execute, bool
 			}
 			catch (Exception e)
 			{
-				log.Warn("Unsuccessful: {0}", sql);
-				log.Warn(e, e.Message);
+				log.Warn(e, "Unsuccessful: {0}", sql);
 				if (throwOnError)
 				{
 					throw;