gateware: Minor syntax fixes

Theses syntax error are ignored by yosys but trying synopsys, it is more
strict, so fix them. Right thing to do anyway ...

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/gateware/icE1usb/rtl/led_blinker.v b/gateware/icE1usb/rtl/led_blinker.v
index 3f9f090..7785ff8 100644
--- a/gateware/icE1usb/rtl/led_blinker.v
+++ b/gateware/icE1usb/rtl/led_blinker.v
@@ -75,7 +75,7 @@
 
 	// Per-led
 	always @(*)
-	begin : led_state
+	begin : led_state_proc
 		integer i;
 		for (i=0; i<4; i=i+1)
 			led[i] = led_state[2*i+1] ? (led_state[2*i] ? blink_fast : blink_slow) : led_state[2*i];