Incorrect usage messages should be sent to stderr.

Signed-off-by: Cristina Opriceana <cristina.oprice...@gmail.com>
---
 tools/iio/generic_buffer.c    | 2 +-
 tools/iio/iio_event_monitor.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/iio/generic_buffer.c b/tools/iio/generic_buffer.c
index 2f4e12f..af350cc 100644
--- a/tools/iio/generic_buffer.c
+++ b/tools/iio/generic_buffer.c
@@ -193,7 +193,7 @@ void process_scan(char *data,
 
 void print_usage(void)
 {
-       printf("Usage: generic_buffer [options]...\n"
+       fprintf(stderr, "Usage: generic_buffer [options]...\n"
               "Capture, convert and output data from IIO device buffer\n"
               "  -c <n>     Do n conversions\n"
               "  -e         Disable wait for event (new data)\n"
diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index 843bc4c..1c138fc 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -251,7 +251,7 @@ int main(int argc, char **argv)
        int fd, event_fd;
 
        if (argc <= 1) {
-               printf("Usage: %s <device_name>\n", argv[0]);
+               fprintf(stderr, "Usage: %s <device_name>\n", argv[0]);
                return -1;
        }
 
-- 
1.9.1

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