[U-Boot] u-boot-usb/master sandbox unit test failure

[Stephen Warren]

Marek,

The latest u-boot-usb master branch breaks the following unit tests for 
the sandbox target (as run by test/py):

8 failed
... test_ut[ut_dm_blk_usb]
... test_ut[ut_dm_usb_flash]
... test_ut[ut_dm_usb_keyb]
... test_ut[ut_dm_usb_multi]
... test_ut[ut_dm_usb_remove]
... test_ut[ut_dm_usb_tree]
... test_ut[ut_dm_usb_tree_remove]
... test_ut[ut_dm_usb_tree_reorder]

The first failure is:

> => ut dm blk_usb
> Test: dm_test_blk_usb: blk.c
> USB0:   scanning bus 1 for devices... usb_setup_descriptor: invalid max packet size
> failed, error -5
> /var/lib/jenkins/workspace/u-boot-denx_uboot_usb-master-build/src/u-boot/test/dm/blk.c:78, dm_test_blk_usb(): 0 == uclass_get_device(UCLASS_MASS_STORAGE, 0, &usb_dev): Expected 0, got -19
> Test: dm_test_blk_usb: blk.c (flat tree)
> USB0:   scanning bus 1 for devices... usb_setup_descriptor: invalid max packet size
> failed, error -5
> /var/lib/jenkins/workspace/u-boot-denx_uboot_usb-master-build/src/u-boot/test/dm/blk.c:78, dm_test_blk_usb(): 0 == uclass_get_device(UCLASS_MASS_STORAGE, 0, &usb_dev): Expected 0, got -19
> Failures: 2

The others all look essentially the same.

It looks like this was introduced sometime on Saturday (US time, 
ignoring my Jenkins polling delay), and the two subsequent pushes on 
Sunday and Monday didn't solve this.