[PATCH 08/10] iotests: use 'with open()' where applicable

[John Snow <jsnow@redhat.com>]

More pylint 2.8.x warning hushing: use open's context manager where it's
applicable to do so to avoid a warning.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 tests/qemu-iotests/iotests.py | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 46deb7f4dd4..5d5ec40429b 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -335,13 +335,12 @@ def compare_images(img1, img2, fmt1=imgfmt, fmt2=imgfmt):
 
 def create_image(name, size):
     '''Create a fully-allocated raw image with sector markers'''
-    file = open(name, 'wb')
-    i = 0
-    while i < size:
-        sector = struct.pack('>l504xl', i // 512, i // 512)
-        file.write(sector)
-        i = i + 512
-    file.close()
+    with open(name, 'wb') as outfile:
+        i = 0
+        while i < size:
+            sector = struct.pack('>l504xl', i // 512, i // 512)
+            outfile.write(sector)
+            i = i + 512
 
 def image_size(img):
     '''Return image's virtual size'''
-- 
2.30.2