Fix Source Error Hang

This fixes a bug in ez where an error thrown by a Source may cause the
process to hang.

ez/ez.go

@@ -171,16 +171,6 @@ func ConfigFileEnvFlagDecoderFactoryParams[T any, TP ConfigWithConfigPath[T]](ct
 		flagSrc = fset
 	}
 
-	// If file-watching is not enabled, we should shutdown the monitor
-	// goroutine when exiting this function.
-	// Usually `dials.Config` is smart enough not to start a monitor when
-	// there are no `Watcher` implementations in the source-list, but the
-	// `Blank` source uses `Watcher` for its core functionality, so we need
-	// to shutdown the blank source to actually clean up resources.
-	if !params.WatchConfigFile {
-		defer blank.Done(ctx)
-	}
-
 	dp := dials.Params[T]{
 		// Set the OnNewConfig callback. It'll be suppressed by the
 		// CallGlobalCallbacksAfterVerificationEnabled until just before we return.
@@ -199,6 +189,16 @@ func ConfigFileEnvFlagDecoderFactoryParams[T any, TP ConfigWithConfigPath[T]](ct
 		return nil, err
 	}
 
+	// If file-watching is not enabled, we should shutdown the monitor
+	// goroutine when exiting this function.
+	// Usually `dials.Config` is smart enough not to start a monitor when
+	// there are no `Watcher` implementations in the source-list, but the
+	// `Blank` source uses `Watcher` for its core functionality, so we need
+	// to shutdown the blank source to actually clean up resources.
+	if !params.WatchConfigFile {
+		defer blank.Done(ctx)
+	}
+
 	basecfg := d.View()
 	cfgPath, filepathSet := (TP)(basecfg).ConfigPath()
 	if !filepathSet {