drm/msm: fix workqueue leak on bind errors

Make sure to destroy the workqueue also in case of early errors during
bind (e.g. a subcomponent failing to bind).

Since commit c3b790ea07a1 ("drm: Manage drm_mode_config_init with
drmm_") the mode config will be freed when the drm device is released
also when using the legacy interface, but add an explicit cleanup for
consistency and to facilitate backporting.

Fixes: 060530f1ea67 ("drm/msm: use componentised device support")
Cc: [email protected]      # 3.15
Cc: Rob Clark <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/525093/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

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