In nvs writing addresses are u32_t. Coverty reports two situations
where the address could be converted (unwanted) to a signed value.
Both have been corrected.
There is however a general problem with flash API where the addresses
are defined as off_t which is a s32_t. These are converted in the flash
hal to u32_t. As a result of this only half of the possible range can
be used.
Solves #20867 and #20866
Signed-off-by: Laczen JMS <laczenjms@gmail.com>
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