Memory leak patch from Carlos Garcia Campos (#6947).

	* glib/poppler-action.cc:
	* glib/poppler-document.cc:
	* glib/poppler-page.cc:
	* poppler/CairoFontEngine.cc:
	* poppler/CairoFontEngine.h:
	* poppler/CairoOutputDev.cc:
	* poppler/CairoOutputDev.h:
	* poppler/Gfx.cc:
	* poppler/TextOutputDev.cc:  Fix various memory leaks.