misc: fix sfence detection logic

src/memory/paddr.c

@@ -105,7 +105,9 @@ static inline void pmem_write(paddr_t addr, word_t data, int len) {
 
 void rtl_sfence() {
 #ifdef ENABLE_DISAMBIGUATE
-  memset(pmem_dirty, 0, sizeof(sizeof(bool) * PMEM_SIZE));
+  for (uint64_t i = 0; i < PMEM_SIZE; i++) {
+    pmem_dirty[i] = 0;
+  }
 #endif
 }