removed unused variable

Author: Sriya Pratipati

libc/src/__support/HashTable/randomness.h

@@ -35,7 +35,6 @@ LIBC_INLINE uint64_t next_random_seed() {
     entropy[0] = reinterpret_cast<uint64_t>(&entropy);
     entropy[1] = reinterpret_cast<uint64_t>(&state);
 #if defined(LIBC_HASHTABLE_USE_GETRANDOM)
-    int errno_backup = libc_errno;
     size_t count = sizeof(entropy);
     uint8_t *buffer = reinterpret_cast<uint8_t *>(entropy);
     while (count > 0) {