drm/vc4: clean up error handling on devm_kzalloc failure

The current error handling when devm_kzalloc fails performs a
non-null check on connector which is redundant because connector
is null at that failure point.  Once this is removed, make the
failure path into a trivial -ENOMEM return to clean up the
error handling. Also remove need to initialize connector to NULL.

Detected by CoverityScan CID#1339527 ("Logically dead code")
Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: Eric Anholt <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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