staging: iio: Documentation: Introduce iio_utils.c

This patch removes inline functions from iio_utils.h in order to clean the
code. iio_utils.c contains the implementation of the functions used by
iio_event_monitor.c, lsiio.c or generic_buffer.c and iio_utils.h contains
the declarations of these functions.

Since iio_utils.h is modified, generic_buffer.c and iio_event_monitor.c
must include stdlib.h.
Signed-off-by: Roberta Dobrescu <roberta.dobrescu@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/Documentation/generic_buffer.c

@@ -21,6 +21,7 @@
 #define _GNU_SOURCE
 
 #include <unistd.h>
+#include <stdlib.h>
 #include <dirent.h>
 #include <fcntl.h>
 #include <stdio.h>

drivers/staging/iio/Documentation/iio_event_monitor.c

@@ -19,6 +19,7 @@
 #define _GNU_SOURCE
 
 #include <unistd.h>
+#include <stdlib.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <errno.h>