fix signed/unsigned warning

extras/path_id/path_id.c

@@ -28,7 +28,7 @@
 #include <dirent.h>
 #include <getopt.h>
 
-#include <libudev.h>
+#include <../../udev/lib/libudev.h>
 #include <../../udev/udev.h>
 
 int debug;

udev/lib/libudev-monitor.c

@@ -544,7 +544,7 @@ retry:
 			return NULL;
 		if (nlh->properties_off < sizeof(struct udev_monitor_netlink_header))
 			return NULL;
-		if (nlh->properties_off+32U > buflen)
+		if (nlh->properties_off+32 > buflen)
 			return NULL;
 		bufpos = nlh->properties_off;
 	} else {