smb-lib: fix Type-C detection after sink removal

A misplaced return statement causes an early return from disabling OTG.

If OTG is enabled when a source is attached then Type-C detection will
fail. Therefore, OTG should never be blocked from being disabled.

Remove all of the early returns that could potentially block the
register write which disables OTG.

Change-Id: I4645210233c7490cf3e1b8f6a629fec60399b250
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>