tools: iio: Remove explicit NULL comparison

Remove explicit NULL comparison and write it in its simpler form as
recommended by checkpatch.pl.

Signed-off-by: Cristina Opriceana <cristina.opriceana@gmail.com>
Reviewed-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 0e73723..9535c2d 100644
--- a/tools/iio/generic_buffer.c
+++ b/tools/iio/generic_buffer.c
@@ -270,7 +270,7 @@
 		}
 	}
 
-	if (device_name == NULL) {
+	if (!device_name) {
 		printf("Device name not set\n");
 		print_usage();
 		return -1;
@@ -290,7 +290,7 @@
 		return -ENOMEM;
 
 	if (!notrigger) {
-		if (trigger_name == NULL) {
+		if (!trigger_name) {
 			/*
 			 * Build the trigger name. If it is device associated
 			 * its name is <device_name>_dev[n] where n matches