Backport of "alsasrc: Don't use driver timestamp if it's zero" into 1.16
Backport of !250 (merged) "alsasrc: Don't use driver timestamp if it's zero".
Commits:
- ed330115 alsasrc: Don't use driver timestamp if it's zero
Backport of !250 (merged) "alsasrc: Don't use driver timestamp if it's zero".
Commits: