axi_dmac: src_fifo_inf: Clear pipeline when no transfers are active

Clear the pipeline when no transfers are active to make sure that we do not
get residual data on the first sample for the next transfer.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

library/axi_dmac/src_fifo_inf.v

@@ -108,12 +108,12 @@ begin
 		if (enable) begin
 			if (en) begin
 				valid <= 1'b1;
-			end else if (ready) begin
+			end else if (ready || ~xfer_req) begin
 				valid <= 1'b0;
 			end
 			overflow <= en & valid & ~ready;
 		end else begin
-			if (ready)
+			if (ready || ~xfer_req)
 				valid <= 1'b0;
 			overflow <= en;
 		end