drm/i915/bios: double check array-boundary in parse_sdvo_lvds_data

During static analysis, a concern was raised that we may access the
dtd->dtd[] array out of bounds, because we are not checking whether
the index we use is larger than the array.

This should not be a problem as is, because the enumeration that is
used for this index comes from "panel_type", which uses an enumeration
with 4 items.  But if this enumeration is ever changed, it can lead to
hard-to-detect bugs, so better double-check it before using it as an
index to the array.

Signed-off-by: Luca Coelho <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Signed-off-by: Suraj Kandpal <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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