Fix can_speak check in megaphone

The original check actually made no sense, but worked because it returned false every time as there was never a message passed through

code/game/objects/items/devices/megaphone.dm

@@ -17,12 +17,11 @@
 		if(user.client.prefs.muted & MUTE_IC)
 			src << "<span class='warning'>You cannot speak in IC (muted).</span>"
 			return
+
 	if(!ishuman(user))
 		user << "<span class='warning'>You don't know how to use this!</span>"
 		return
-	if(user.can_speak())
-		user << "<span class='warning'>You find yourself unable to speak at all.</span>"
-		return
+
 	if(spamcheck > world.time)
 		user << "<span class='warning'>\The [src] needs to recharge!</span>"
 		return
@@ -30,7 +29,12 @@
 	var/message = copytext(sanitize(input(user, "Shout a message?", "Megaphone", null)  as text),1,MAX_MESSAGE_LEN)
 	if(!message)
 		return
+
 	message = capitalize(message)
+	if(!user.can_speak(message))
+		user << "<span class='warning'>You find yourself unable to speak at all.</span>"
+		return
+
 	if ((src.loc == user && user.stat == 0))
 		if(emagged)
 			if(insults)
@@ -60,4 +64,4 @@
 
 /obj/item/device/megaphone/cargo
 	name = "supply megaphone"
-	icon_state = "megaphone-cargo"
+	icon_state = "megaphone-cargo"