samples: remove duplicate include in fs-monitor.c

'sys/types.h' included in 'samples/fanotify/fs-monitor.c'
is duplicated.It is also included on 15 line.

Link: https://lore.kernel.org/r/20211101075152.35780-1-zhang.mingyu@zte.com.cn
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Zhang Mingyu <zhang.mingyu@zte.com.cn>
Signed-off-by: Jan Kara <jack@suse.cz>

Author: Zhang Mingyu

samples/fanotify/fs-monitor.c

@@ -12,7 +12,6 @@
 #include <sys/fanotify.h>
 #include <sys/types.h>
 #include <unistd.h>
-#include <sys/types.h>
 
 #ifndef FAN_FS_ERROR
 #define FAN_FS_ERROR		0x00008000