Original commit message from CVS:
* gst/alpha/gstalphacolor.c: (gst_alpha_color_transform_caps):
* gst/debug/negotiation.c: (gst_negotiation_update_caps):
* gst/rtp/gstrtpilbcdepay.c: (gst_rtp_ilbc_depay_setcaps):
don't leak caps-string