bugfix (CollaSet): pod creation error is not thrown out

[wu8685]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y

2. What is the scope of this PR (e.g. component or file name):

fix bug in creation process of CollaSet

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

6. Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

No need to add release note

[zoumo]

can we simplify code to following format

if err := fn1(); err != nil {
	return err
}

if err := fn2(); err != nil {
	return err
}

so the code should be

if pod, err = createPod(); err != nil {
	return err
}
// created
if err = expectCreate(); err != nil {
	return err
}

[wu8685]

fixed