tools:iio:iio_utils: refactor assignment of is_signed

Change the assignment of *is_signed in iioutils_get_type() to a one-liner,
as already done with *be.

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/tools/iio/iio_utils.c b/tools/iio/iio_utils.c
index 0524725..c83f4df 100644
--- a/tools/iio/iio_utils.c
+++ b/tools/iio/iio_utils.c
@@ -168,10 +168,7 @@
 				*mask = ~0;
 			else
 				*mask = (1 << *bits_used) - 1;
-			if (signchar == 's')
-				*is_signed = 1;
-			else
-				*is_signed = 0;
+			*is_signed = (signchar == 's');
 			if (fclose(sysfsfp)) {
 				ret = -errno;
 				printf("Failed to close %s\n", filename);