BUG/MEDIUM: spop-conn: Report short read for partial frames payload

When a frame was not fully received, a short read must be reported on the
SPOP connection to help the demux to handle truncated frames. This was
performed for frames truncated on the header part but not on the payload
part. It is now properly detected.

This patch must be backported to 3.1.

Author: capflam

src/mux_spop.c

@@ -1643,6 +1643,7 @@ static int spop_conn_handle_hello(struct spop_conn *spop_conn)
 
 	/* process full record only */
 	if (b_data(dbuf) < (spop_conn->dfl)) {
+		spop_conn->flags |= SPOP_CF_DEM_SHORT_READ;
 		TRACE_DEVEL("leaving on missing data", SPOP_EV_RX_FRAME|SPOP_EV_RX_HELLO, spop_conn->conn);
 		return 0;
 	}
@@ -1814,6 +1815,7 @@ static int spop_conn_handle_disconnect(struct spop_conn *spop_conn)
 
 	/* process full record only */
 	if (b_data(dbuf) < (spop_conn->dfl)) {
+		spop_conn->flags |= SPOP_CF_DEM_SHORT_READ;
 		TRACE_DEVEL("leaving on missing data", SPOP_EV_RX_FRAME|SPOP_EV_RX_DISCO, spop_conn->conn);
 		return 0;
 	}
@@ -1925,6 +1927,7 @@ static int spop_conn_handle_ack(struct spop_conn *spop_conn, struct spop_strm *s
 
 	/* process full record only */
 	if (b_data(dbuf) < (spop_conn->dfl)) {
+		spop_conn->flags |= SPOP_CF_DEM_SHORT_READ;
 		TRACE_DEVEL("leaving on missing data", SPOP_EV_RX_FRAME|SPOP_EV_RX_DISCO, spop_conn->conn);
 		return 0;
 	}