land_detector: fix timestamp type (#4710)

The overflow of the uint32_t lead to the land_detector start getting
aborted.

src/modules/land_detector/land_detector_main.cpp

@@ -140,7 +140,7 @@ static int land_detector_start(const char *mode)
 	}
 
 	/* avoid memory fragmentation by not exiting start handler until the task has fully started */
-	const uint32_t timeout = hrt_absolute_time() + 5000000; //5 second timeout
+	const uint64_t timeout = hrt_absolute_time() + 5000000; //5 second timeout
 
 	/* avoid printing dots just yet and do one sleep before the first check */
 	usleep(10000);

src/modules/uavcan/uavcan_main.hpp

@@ -103,7 +103,7 @@ 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;
 	}