only set ISO speed once if using 1394B
only set ISO speed once if using 1394B


git-svn-id: dc93cdc0d492efa6a2718942f2c966cf0a364c27@684 9608957c-362e-0410-90bb-ddb82fccb57f

motmot/libcamiface,motmot/libcamiface,motmot/libcamiface,motmot/libcamiface