Fix exception using calibrateCameraRO with iFixedPoint > 0 #15451
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…with iFixedPoint > 0
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resolves #14469
relates #13910
This pullrequest changes
Always allocate _Jo matrix in cvCalibrateCamera2Internal() when releaseObject flag is true. This prevents an attempt to multiply an empty _Jo (causing an exception) when the calcJ flag is true during solver iterations.