initialize passed back pointer areas

to avoid leaving old stuff in.


git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@10980 67ed7778-7388-44ab-90cf-0a291f65f57c

camlibs/ptp2/ptp.c

@@ -1812,6 +1812,8 @@ ptp_canon_eos_getevent (PTPParams* params, PTPCanon_changes_entry **entries, int
 	unsigned int 	size = 0;
 	unsigned char	*data = NULL;
 
+	*nrofentries = 0;
+	*entries = NULL;
 	PTP_CNT_INIT(ptp);
 	ptp.Code = PTP_OC_CANON_EOS_GetEvent;
 	ptp.Nparam = 0;