bug fixes

testbed/mem_alloc/main.bro

@@ -0,0 +1,15 @@
+import "@ffi/c"
+import "@std/mem"
+
+main func() void {
+    allocator :: mem.c_allocator
+
+    data :: mem.alloc(u8, allocator, 24) catch |_| {
+        _ = c.printf("Failed to allocate memory\n")
+        return _
+    }
+    defer mem.free(u8, allocator, data)
+
+    data[0] = 'H'
+    _ = c.printf("data[0] = %s\n", data[0])
+}