Fixed stack overflow in UAVCAN process (#4643)

* Increased uavcan stack size; the old value of 1800 was insufficient

* Removed a misleading warning message from uavcan servers initialization

src/modules/uavcan/uavcan_main.hpp

@@ -99,7 +99,7 @@ class UavcanNode : public device::CDev
 	 */
 
 	static constexpr unsigned RxQueueLenPerIface	= FramePerMSecond * PollTimeoutMs; // At
-	static constexpr unsigned StackSize		= 1800;
+	static constexpr unsigned StackSize		= 2400;
 
 public:
 	typedef uavcan_stm32::CanInitHelper<RxQueueLenPerIface> CanInitHelper;

src/modules/uavcan/uavcan_servers.cpp

@@ -923,7 +923,6 @@ void UavcanServers::unpackFwFromROMFS(const char* sd_path, const char* romfs_pat
 
 	DIR* const romfs_dir = opendir(romfs_path);
 	if (!romfs_dir) {
-		warnx("base: couldn't open %s", romfs_path);
 		return;
 	}