Gstreamer: Emit an error if QCamera::start() fails
If a camera is not started successfully error() signal has to be
emitted.
Added emitting an error from video source.
Emitted only first error to prevent multiple subsequent errors.
Added debug message.
Task-number: QTBUG-51825
Change-Id: I6ac936d2728213a4a64f3e4eb25ae2e2f109acca
Reviewed-by:
Christian Stromme <christian.stromme@qt.io>
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