v4l2object: Don't check size in a non-list value
After commit 1ea9735a I see these error while using the webcam integrated in my laptop: GStreamer-CRITICAL **: gst_value_list_get_size: assertion 'GST_VALUE_HOLDS_LIST (value)' failed The issue is gst_v4l2src_value_simplify() was doing its job of generating a single value, rather than the original list. That why, when getting the list size, a critical warning was raised. This patch takes advantage of the compiler optimizations to verify first if the list was simplified, thus use it directly, otherwise, if it is a list, verify its size. https://bugzilla.gnome.org/show_bug.cgi?id=776106
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