nvmem: core: Fix unintentional sign extension issue

The shifting of the u8 integer buf[3] by 24 bits to the left will
be promoted to a 32 bit signed int and then sign-extended to a
u64. In the event that the top bit of buf[3] is set then all
then all the upper 32 bits of the u64 end up as also being set
because of the sign-extension. Fix this by casting buf[i] to
a u64 before the shift.

Fixes: a28e824fb827 ("nvmem: core: Add functions to make number reading easy")
Reviewed-by: Douglas Anderson <[email protected]>
Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: Srinivas Kandagatla <[email protected]>
Addresses-Coverity: ("Unintended sign extension")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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