kconfig: promote invalid numeric reference from warning to error

The Kconfig interpreter already warns if a numeric option attempts to use
a non-numeric option (bool, tristate, or string) to set its

kconfig: promote invalid numeric reference from warning to error

The Kconfig interpreter already warns if a numeric option attempts to use
a non-numeric option (bool, tristate, or string) to set its value (for
example, with a 'default' or 'range').

Since there is nowhere in the tree that attempts this, we can safely
promote this check from warning to error.

Assisted-by: LLM
Signed-off-by: Julian Braha <julianbraha@gmail.com>
Reviewed-by: Nicolas Schier <n.schier@fritz.com>
Link: https://patch.msgid.link/20260915211508.291790-2-julianbraha@gmail.com
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

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