kernel: add ubsan bindings, fix some UB reported by it

kernel-src/include/kernel/topology.h

@@ -1,7 +1,7 @@
 #ifndef _TOPOLOGY_H
 #define _TOPOLOGY_H
 
-#define TOPOLOGY_MAKE_ID(depth, id) ((depth << 16) | id)
+#define TOPOLOGY_MAKE_ID(depth, id) (((depth & 0xfffflu) << 16) | id)
 
 #include <arch/cpu.h>
 

kernel-src/include/string.h

@@ -7,7 +7,7 @@ size_t strlen(const char *str);
 char *strcpy(char *dest, const char *src);
 char *strcat(char *dest, const char *str);
 void *memcpy(void *dest, const void *src, size_t size);
-void *memset(void *dest, unsigned long what, size_t size);
+void *memset(void *dest, int what, size_t size);
 int strcmp(const char *a, const char *b);
 int strncmp(const char *a, const char *b, size_t c);
 int memcmp(const void *a, const void *b, size_t s);