Fix couple of issues found by coverity scan

src/libstat/backends/redis_backend.c

@@ -240,7 +240,7 @@ rspamd_redis_expand_object (const gchar *pattern,
 		}
 	}
 
-	if (target == NULL) {
+	if (target == NULL || task == NULL) {
 		return tlen;
 	}
 

src/libutil/http.c

@@ -431,6 +431,9 @@ rspamd_http_parse_key (rspamd_ftok_t *data, struct rspamd_http_connection *conn,
 									priv->local_key, priv->msg->peer_key);
 						}
 					}
+					else {
+						rspamd_pubkey_unref (pk);
+					}
 				}
 			}
 

src/libutil/regexp.c

@@ -476,7 +476,7 @@ fin:
 		res->raw_re = pcre2_compile (real_pattern, PCRE2_ZERO_TERMINATED,
 					regexp_flags & ~PCRE_FLAG(UTF),
 					&err_code, &err_off, pcre2_ctx);
-		if (r == NULL) {
+		if (res->raw_re == NULL) {
 			err_str = g_alloca (1024);
 			memset (err_str, 0, 1024);
 			pcre2_get_error_message (err_code, err_str, 1024);

src/rspamadm/configdump.c

@@ -104,6 +104,7 @@ rspamadm_add_doc_elt (const ucl_object_t *obj, const ucl_object_t *doc_obj,
 		nobj = ucl_object_fromstring_common ("/*", 0, 0);
 	}
 	else {
+		rspamd_fstring_free (comment);
 		return;
 	}