Use libkernaux asserts

kernel/main.c

@@ -28,6 +28,8 @@ void main(
     const unsigned long multiboot2_magic,
     const struct KernAux_Multiboot2 *const multiboot2_info
 ) {
+    kernaux_assert_cb = kernaux_assert_fn;
+
     if (multiboot2_magic != KERNAUX_MULTIBOOT2_MAGIC) {
         panic("Multiboot 2 magic number is invalid.");
     }

kernel/panic.c

@@ -13,3 +13,13 @@ void halt()
 {
     panic("Kernel main function returned.");
 }
+
+void kernaux_assert_fn(
+    const char *const file,
+    const int line,
+    const char *const str
+) {
+    kernaux_console_printf("[FAIL] assertion failed: %s:%u: %s\n",
+                           file, line, str);
+    kernaux_arch_i386_hang();
+}

kernel/panic.h

@@ -1,8 +1,11 @@
 #ifndef KERNEL_INCLUDED_PANIC
 #define KERNEL_INCLUDED_PANIC 1
 
-void panic(const char *s);
+#include <kernaux/assert.h>
 
 #define assert(cond, s) { if (!(cond)) { panic(s); } }
 
+void panic(const char *s);
+void kernaux_assert_fn(const char *file, int line, const char *str);
+
 #endif