add assert to make sure our assembly works

test-inline-assembly.c

@@ -1,3 +1,4 @@
+#include <assert.h>
 #include <stdio.h>
 
 int main() {
@@ -10,6 +11,7 @@ int main() {
      );
 
   printf("i = %d\n", i);
+  assert(i == 23);
 
   return 0;
 }