Use size_t where relevant

src/cache_timing.c

@@ -4,7 +4,7 @@
 
 #include "util.h"
 
-const uint64_t REPEATS = 100000;
+const size_t REPEATS = 100000;
 
 int main() {
     uint64_t min_miss = UINT64_MAX;

src/index_guesser.c

@@ -6,8 +6,8 @@
 
 #include "stage2.h"
 
-const uint64_t MIN_CHOICE = 1;
-const uint64_t MAX_CHOICE = 256;
+const size_t MIN_CHOICE = 1;
+const size_t MAX_CHOICE = 256;
 
 static inline page_t *init_pages(void) {
     return calloc(MAX_CHOICE, sizeof(page_t));