tools:iio:generic_buffer: fix check of errno

Since errno contains the value of any of the defined error names, a
negation will not lead to the desired match.

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/tools/iio/generic_buffer.c b/tools/iio/generic_buffer.c
index 7635aeb..e01c80e 100644
--- a/tools/iio/generic_buffer.c
+++ b/tools/iio/generic_buffer.c
@@ -321,7 +321,7 @@
 				 data,
 				 toread*scan_size);
 		if (read_size < 0) {
-			if (errno == -EAGAIN) {
+			if (errno == EAGAIN) {
 				printf("nothing available\n");
 				continue;
 			} else