runtime: fix typo in comment
Change-Id: I82e35770b45ccd1433dfae0af423073c312c0859
Reviewed-on: https://go-review.googlesource.com/23680
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/src/runtime/traceback.go b/src/runtime/traceback.go
index f9d9f21..96f154e2 100644
--- a/src/runtime/traceback.go
+++ b/src/runtime/traceback.go
@@ -844,8 +844,8 @@
// If the Context field is not 0, then it is a value returned by a
// previous call to the context function. This case is called when the
// context is no longer needed; that is, when the Go code is returning
-// to its C code caller. This permits permits the context function to
-// release any associated resources.
+// to its C code caller. This permits the context function to release
+// any associated resources.
//
// While it would be correct for the context function to record a
// complete a stack trace whenever it is called, and simply copy that
