Fix CRYPTO_hwrand comment.

Missed a mention of CRYPTO_have_hwrand.

Change-Id: I9756d80105c2fcee487a7badbf4d82f375b5652d
Reviewed-on: https://boringssl-review.googlesource.com/5640
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/rand/internal.h b/crypto/rand/internal.h
index 50ecf4d..f35abbb 100644
--- a/crypto/rand/internal.h
+++ b/crypto/rand/internal.h
@@ -24,8 +24,7 @@
  * system. */
 void CRYPTO_sysrand(uint8_t *buf, size_t len);
 
-/* CRYPTO_hwrand fills |len| bytes at |buf| with entropy from the hardware.
- * This function can only be called if |CRYPTO_have_hwrand| returns one. It
+/* CRYPTO_hwrand fills |len| bytes at |buf| with entropy from the hardware. It
  * returns one on success or zero on hardware failure or if hardware support is
  * unavailable. */
 int CRYPTO_hwrand(uint8_t *buf, size_t len);