thunderbolt: Fix double free of drom buffer

[ Upstream commit 2ffa9a5d76a75abbc1f95c17959fced666095bdd ]

If tb_drom_read() fails, sw->drom is freed but not set to NULL.  sw->drom
is then freed again in the error path of tb_switch_alloc().

The bug can be triggered by unplugging a thunderbolt device shortly after
it is detected by the thunderbolt driver.

Clear sw->drom if tb_drom_read() fails.

[bhelgaas: add Fixes:, stable versions of interest]
Fixes: 343fcb8c ("thunderbolt: Fix nontrivial endpoint devices.")
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v3.17+
CC: Lukas Wunner <lukas@wunner.de>

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>