bpo-9194: Fix the bounds checking in winreg.c's fixupMultiSZ() (pytho…

…nGH-12687)

(cherry picked from commit 56ed864)

PC/_winreg.c

@@ -727,7 +727,7 @@ fixupMultiSZ(char **str, char *data, int len)
     Q = data + len;
     for (P = data, i = 0; P < Q && *P != '\0'; P++, i++) {
         str[i] = P;
-        for(; *P != '\0'; P++)
+        for (; P < Q && *P != '\0'; P++)
             ;
     }
 }