[Mahi] Return instead of crash if initialize unsuccessfully

Avoid crash when initialize unsuccessfully.

Bug: b:345825191
Change-Id: I0368c025fbd39375330576d323e7e59823117c1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5609912


Reviewed-by: Andre Le <leandre@chromium.org>
Commit-Queue: Thanh Nguyen <thanhdng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1312428}