[bloaty] Pass file to goroutine closure

Might help address the -too-many-open-files issue

Change-Id: I3e20b79e2b40290a2caaa569cf11a15675be85d7
diff --git a/bloaty/bloaty.go b/bloaty/bloaty.go
index 0a5944d..16af3d0 100644
--- a/bloaty/bloaty.go
+++ b/bloaty/bloaty.go
@@ -188,10 +188,10 @@
 
 	for file := range fileBuffer {
 		wg.Add(1)
-		go func() {
+		go func(file string) {
 			run(bloatyPath, file, data)
 			wg.Done()
-		}()
+		}(file)
 	}
 
 	go func() {