parser: fix memory leak

 - add Supported header to the list of headers that performs memory allocation

(cherry picked from commit b52b2b9)

parser/hf.h

@@ -202,6 +202,7 @@ static inline int hdr_allocs_parse(struct hdr_field* hdr)
 		case HDR_WWW_AUTHENTICATE_T:
 		case HDR_PROXY_AUTHENTICATE_T:
 		case HDR_ALLOW_T:
+		case HDR_SUPPORTED_T:
 			return 1;
 		default:
 			return 0;