Update

[ghstack-poisoned]

Author: manuelcandales

backends/apple/metal/runtime/shims/et_metal.mm

@@ -746,6 +746,7 @@ int metal_copy_memory(void* dst, const void* src, size_t nbytes, bool src_is_dev
 
     if (length == 0) {
         return;
+    }
 
     // Check that offsets are within buffer bounds before copying
     if (!srcBuffer || !dstBuffer) {