Remove a comment.

Follow up to https://r.android.com/c/3341580

Bug: None
Test: None
Change-Id: I113c97e4e461684ce75b1b59ed7c7ffe975784fa
diff --git a/libc/include/malloc.h b/libc/include/malloc.h
index 850eeca..ac27467 100644
--- a/libc/include/malloc.h
+++ b/libc/include/malloc.h
@@ -76,11 +76,6 @@
  */
 __nodiscard void* _Nullable realloc(void* _Nullable __ptr, size_t __byte_count) __BIONIC_ALLOC_SIZE(2);
 
-// The reallocarray polyfill is only available when in weak API mode to avoid
-// collisions with existing polyfills. The only known conflict is in libconfuse,
-// so if that's ever fixed upstream the guard could probably be removed.
-// https://github.com/android/ndk/issues/2081
-
 /**
  * [reallocarray(3)](https://man7.org/linux/man-pages/man3/realloc.3.html) resizes
  * allocated memory on the heap.