py/parsenumbase: Favor clarity of code over manual optimisation.

Follow up to 13b13d1, based on some
testing on godbolt, the manual code optimisation seems unnecessary for code
size, at least on gcc x86_64 and ARM, and it's definitely not good for
clarity.

Signed-off-by: Jeff Epler <[email protected]>

Author: jepler

py/parsenumbase.c

@@ -41,11 +41,11 @@ size_t mp_parse_num_base(const char *str, size_t len, int *base) {
     if (c == '0') {
         c = *(p++) | 32;
         int b = *base;
-        if (c == 'x' && !(b & ~16)) {
+        if (c == 'x' && (b == 0 || b == 16)) {
             *base = 16;
-        } else if (c == 'o' && !(b & ~8)) {
+        } else if (c == 'o' && (b == 0 || b == 8)) {
             *base = 8;
-        } else if (c == 'b' && !(b & ~2)) {
+        } else if (c == 'b' && (b == 0 || b == 2)) {
             *base = 2;
         } else {
             p -= 2;