block_hotplug: Use the correct 'blk_extra_params' separator
The 'blk_extra_params' uses ',' as separator and not ' '. Using ' '
leads to ' serial' instead of 'serial' being passed as an argument.
Theoretically I could just use '=' without any separator, but in order
to keep '+=' I decided to simply add the separator here. Empty inputs
are automatically skipped on parsing.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>
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