Fix folly/FBString.h build error

Summary:
Looks like D880140 left off this part when it was committed.

This fixes the build.

Test Plan: runtests

Reviewed By: vini@fb.com

FB internal diff: D881445

diff --git a/folly/FBString.h b/folly/FBString.h
index 04b90a7c364ffc11a5d4106a5edbb84d579d4291..cc34fe668491447f71c46b06046236222583bfcb 100644 (file)
--- a/folly/FBString.h
+++ b/folly/FBString.h
@@ -1532,7 +1532,7 @@ private:
     for (; b != e; ++b) {
       temp.push_back(*b);
     }
-    temp.append(i, end());
+    temp.append(i, cend());
     swap(temp);
     return begin() + pos;
   }