bpo-37752: Delete redundant Py_CHARMASK in normalizestring() (GH-15095)

Python/mystrtoul.c

diff --git a/Python/mystrtoul.c b/Python/mystrtoul.c
index 7ab5814..19fa57a 100644
--- a/Python/mystrtoul.c
+++ b/Python/mystrtoul.c
@@ -99,7 +99,7 @@
     int ovlimit;       /* required digits to overflow */
 
     /* skip leading white space */
-    while (*str && Py_ISSPACE(Py_CHARMASK(*str)))
+    while (*str && Py_ISSPACE(*str))
         ++str;
 
     /* check for leading 0b, 0o or 0x for auto-base or base 16 */
@@ -138,7 +138,7 @@
                 /* skip all zeroes... */
                 while (*str == '0')
                     ++str;
-                while (Py_ISSPACE(Py_CHARMASK(*str)))
+                while (Py_ISSPACE(*str))
                     ++str;
                 if (ptr)
                     *ptr = (char *)str;
@@ -266,7 +266,7 @@
     unsigned long uresult;
     char sign;
 
-    while (*str && Py_ISSPACE(Py_CHARMASK(*str)))
+    while (*str && Py_ISSPACE(*str))
         str++;
 
     sign = *str;