fs: logging ext4 resize error

log error in case resize2fs fails.

src/utils/fs.py

@@ -207,9 +207,11 @@ def _reduce_resize2fs(partdev):
     cmd = shlex.split(f'resize2fs -fpM {partdev}')
     with open('/tmp/command.log', 'ab', 0) as logfile:
         proc = subprocess.run(cmd, stdout=logfile, stderr=STDOUT)
-        ret = proc.returncode
+        if proc.returncode != 0:
+            logging.error('failed to resize {partdev} with ext4')
+            return -1
 
-    return 0 if ret == 0 else -1
+    return 0
 
 
 def _reduce_ntfsresize(partdev):