K 10
svn:author
V 6
andrew
K 8
svn:date
V 27
2020-07-01T12:07:28.336358Z
K 7
svn:log
V 255
Simplify the flow when getting/setting an isrc

Rather than unlocking and returning we can just perform the needed action
only when the interrupt source is valid and reuse the unlock in both the
valid irq and invalid irq cases.

Sponsored by:	Innovate UK

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