Update src/nuklear_buffer.c

Just a "Commit suggestion" is fine 😉

Author: RobLoach

src/nuklear_buffer.c

@@ -118,6 +118,7 @@ nk_buffer_realloc(struct nk_buffer *b, nk_size capacity, nk_size *size)
     /* HACK: this simulates realloc with malloc+memcpy+free
      * for backwards compatibility reasons, see the note in nk_malloc */
     temp = b->pool.alloc(b->pool.userdata, 0, capacity);
+    NK_ASSERT(temp);
     if (!temp) return 0;
     *size = capacity;
     NK_MEMCPY(temp, b->memory.ptr, buffer_size);