runtime: fix a comment

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5975043

diff --git a/src/pkg/runtime/proc.c b/src/pkg/runtime/proc.c
index 04a9926283bd397bbc568f2665a194470f924ba5..12dc910f047842cfc4a1ee68c35ab19aab1f86ce 100644 (file)
--- a/src/pkg/runtime/proc.c
+++ b/src/pkg/runtime/proc.c
@@ -1376,7 +1376,7 @@ rundefer(void)
 }
 
 // Free stack frames until we hit the last one
-// or until we find the one that contains the argp.
+// or until we find the one that contains the sp.
 static void
 unwindstack(G *gp, byte *sp)
 {