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Added missing error check that could cause kubelet to crash

**What this PR does / why we need it**:
Adds missing error check. An error can happen due to a race condition when watched files change, or become inaccessible. This can happen if a file was added to the driver directory then quickly removed, in which case the callback will be called with non-nil `err` and nil `info`, which is not checked, causing kubelet to crash.

**Which issue(s) this PR fixes**:
Fixes #60861

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```