regcache: flat: Require max_registers to be set
If max_register is unset, regcache_flat_get_index will return 0 and only memory for 1 unsigned int will be allocated, resulting in writing out of bounds. Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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