bindings: python: bail-out if the line was not found in gpiofind.py

Currently we're not checking if the object returned from
gpiod.fine_line() is None which results in an attribute error being
raised when we try to call line methods on a non-line object.

Add an if and bail-out with an error code if the line with given name
was not found.

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>

diff --git a/bindings/python/examples/gpiofind.py b/bindings/python/examples/gpiofind.py
index 77363f78efee05c9b481c1993e4c0e950968a164..30b8e2bb96f0e0ed6066d1cd68813d597d56aea9 100755 (executable)
--- a/bindings/python/examples/gpiofind.py
+++ b/bindings/python/examples/gpiofind.py
@@ -13,5 +13,8 @@ import gpiod
 import sys
 
 line = gpiod.find_line(sys.argv[1])
+if line is None:
+    sys.exit(1)
+
 print('{} {}'.format(line.owner().name(), line.offset()))
 line.owner().close()