[media] stv090x: handle allocation failures

kmalloc() can fail so check whether state->internal is NULL.
append_internal() can return NULL on allocation failures so check that.
Also if we hit the error condition later in the function then there is
a memory leak and we need to call remove_dev() to fix it.

Also Oliver Endriss pointed out an additional leak that I missed in the
first version of this patch.

Signed-off-by: Dan Carpenter <[email protected]>
Acked-by: Oliver Endriss <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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