Fix segfault

Author: yatsukhnenko

library.c

@@ -2581,7 +2581,9 @@ redis_sock_set_stream_context(RedisSock *redis_sock, zval *options)
         redis_sock->stream_ctx = php_stream_context_alloc();
 
     ZEND_HASH_FOREACH_STR_KEY_VAL(Z_ARRVAL_P(options), zkey, z_ele) {
-        php_stream_context_set_option(redis_sock->stream_ctx, "ssl", ZSTR_VAL(zkey), z_ele);
+        if (zkey != NULL) {
+            php_stream_context_set_option(redis_sock->stream_ctx, "ssl", ZSTR_VAL(zkey), z_ele);
+        }
     } ZEND_HASH_FOREACH_END();
 
     return SUCCESS;

redis.c

@@ -606,6 +606,9 @@ PHP_METHOD(Redis, __construct)
         redis->sock = redis_sock_create("127.0.0.1", 0, 6379, 0, 0, 0, NULL, 0);
 
         ZEND_HASH_FOREACH_STR_KEY_VAL(Z_ARRVAL_P(opts), zkey, val) {
+            if (zkey == NULL) {
+                continue;
+            }
             ZVAL_DEREF(val);
             if (zend_string_equals_literal_ci(zkey, "host")) {
                 if (Z_TYPE_P(val) != IS_STRING) {