lib: Fix sbi_strchr to correctly handle null terminator search

The original sbi_strchr implementation did not conform to the C standard
behavior. According to the C standard and POSIX specification, strchr(s, 0)
should return a pointer to the null terminator at the end of string s.

The previous implementation used a while loop that would terminate when
either reaching the end of string or finding the character, but it would
return NULL when searching for the null terminator instead of returning
a pointer to the null terminator itself.

The fixed implementation uses a do-while loop that ensures even when
searching for the null terminator, the function correctly returns a
pointer to the null terminator position rather than NULL.

This fix ensures sbi_strchr behavior aligns with standard library
function semantics, making it more predictable and safe for users
expecting standard C library behavior.

Signed-off-by: Chen Pei <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

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