staging: iio: quell asprintf() warning, missing #includes

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/iio/Documentation/generic_buffer.c

@@ -18,6 +18,8 @@
  *
  */
 
+#define _GNU_SOURCE
+
 #include <unistd.h>
 #include <dirent.h>
 #include <fcntl.h>
@@ -29,6 +31,7 @@
 #include <string.h>
 #include <poll.h>
 #include <endian.h>
+#include <getopt.h>
 #include <inttypes.h>
 #include "iio_utils.h"
 

drivers/staging/iio/Documentation/iio_utils.h

@@ -13,6 +13,7 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <dirent.h>
+#include <errno.h>
 
 /* Made up value to limit allocation sizes */
 #define IIO_MAX_NAME_LENGTH 30