axi_dmac: src_fifo_inf: Simplify data path

Improves timing a bit

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

library/axi_dmac/src_fifo_inf.v

@@ -90,6 +90,14 @@ begin
 	end
 end
 
+always @(posedge clk)
+begin
+	if (en) begin
+		buffer <= din;
+		buffer_sync <= sync;
+	end
+end
+
 always @(posedge clk)
 begin
 	if (resetn == 1'b0) begin
@@ -98,8 +106,6 @@ begin
 	end else begin
 		if (enable) begin
 			if (en) begin
-				buffer <= din;
-				buffer_sync <= sync;
 				valid <= 1'b1;
 			end else if (ready) begin
 				valid <= 1'b0;