qemu_img_json() gives better diagnostic information on failure.

Signed-off-by: John Snow <js...@redhat.com>
Reviewed-by: Hanna Reitz <hre...@redhat.com>
---
 tests/qemu-iotests/iotests.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 56aa068277..4725313150 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -309,11 +309,11 @@ def qemu_img_json(*args: str) -> Any:
 
     return json.loads(res.stdout)
 
-def qemu_img_measure(*args):
-    return json.loads(qemu_img_pipe("measure", "--output", "json", *args))
+def qemu_img_measure(*args: str) -> Any:
+    return qemu_img_json("measure", "--output", "json", *args)
 
-def qemu_img_check(*args):
-    return json.loads(qemu_img_pipe("check", "--output", "json", *args))
+def qemu_img_check(*args: str) -> Any:
+    return qemu_img_json("check", "--output", "json", *args)
 
 def qemu_img_pipe(*args: str) -> str:
     '''Run qemu-img and return its output'''
-- 
2.34.1


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