net: http_client: Fix handling of POLLHUP

POLLHUP event may be returned even if there is still data to read
and POLLIN is set. To ensure all data is consumed, check for
POLLHUP after handling POLLIN.

https://man7.org/linux/man-pages/man2/poll.2.html

Signed-off-by: Juha Ylinen <juha.ylinen@nordicsemi.no>

Author: juhaylinen

subsys/net/lib/http/http_client.c

@@ -517,9 +517,6 @@ static int http_wait_data(int sock, struct http_request *req, const k_timepoint_
 		} else if (fds[0].revents & ZSOCK_POLLNVAL) {
 			ret = -EBADF;
 			goto error;
-		} else if (fds[0].revents & ZSOCK_POLLHUP) {
-			/* Connection closed */
-			goto closed;
 		} else if (fds[0].revents & ZSOCK_POLLIN) {
 			received = zsock_recv(sock, req->internal.response.recv_buf + offset,
 					      req->internal.response.recv_buf_len - offset, 0);
@@ -593,6 +590,9 @@ static int http_wait_data(int sock, struct http_request *req, const k_timepoint_
 					req->internal.response.recv_buf + processed,
 					offset);
 			}
+		} else if (fds[0].revents & ZSOCK_POLLHUP) {
+			/* Connection closed */
+			goto closed;
 		}
 
 	} while (!req->internal.response.message_complete);