DPE: Fix bitwise operation order in convert_to_ascii_hex

In C, the & operator has a lower precedence than bit shifts.
As a result, the mask for the high nibble is shifted instead
of the result of the bitwise AND. Fix this by adding parentheses.

Signed-off-by: Aditya Deshpande <aditya.deshpande@arm.com>
Change-Id: I55cc0791c3d2142bb8a8c2b156787e1ee8dbaa1e
1 file changed