Use a real list comprehension rather than list() around a generator (#25594)

It's faster and more idiomatic.

contrib/inventory/ec2.py

@@ -806,7 +806,7 @@ class Ec2Inventory(object):
             errors.append(' - AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment vars found but may not be correct')
 
         boto_paths = ['/etc/boto.cfg', '~/.boto', '~/.aws/credentials']
-        boto_config_found = list(p for p in boto_paths if os.path.isfile(os.path.expanduser(p)))
+        boto_config_found = [p for p in boto_paths if os.path.isfile(os.path.expanduser(p))]
         if len(boto_config_found) > 0:
             errors.append(" - Boto configs found at '%s', but the credentials contained may not be correct" % ', '.join(boto_config_found))
         else: