better panic

src/mem/paging/pmm.c

@@ -66,7 +66,10 @@ static uintptr_t g_freelist = 0;
 
 uintptr_t pmm_alloc()
 {
-    if (!g_freelist) return 0;
+    if (!g_freelist)
+	{
+		panic(NULL, "PMM is out of memory!");		
+	}
     uintptr_t addr = g_freelist;
     g_freelist = *(uintptr_t*) PHYS_TO_VIRT(g_freelist);
     return addr;
@@ -104,4 +107,4 @@ void pmm_init(struct limine_memmap_response* memmap, struct limine_hhdm_response
     // Now we have biggest USABLE region,
     // so to populate the free list we just iterate through it
     pmm_init_freelist();
-}
+}