Mark re-used ph_list2 array as undefined

And fix looking after end of array.

src/libespeak-ng/phonemelist.c

@@ -72,7 +72,7 @@ static int SubstitutePhonemes(PHONEME_LIST *plist_out)
 				next = phoneme_tab[ph_list2[ix+1].phcode];
 
 			word_end = false;
-			if ((plist2+1)->sourceix || ((next != 0) && (next->type == phPAUSE)))
+			if (ix == n_ph_list2 -1 || (plist2+1)->sourceix || ((next != 0) && (next->type == phPAUSE)))
 				word_end = true; // this phoneme is the end of a word
 
 			// check whether a Voice has specified that we should replace this phoneme

src/libespeak-ng/translate.c

@@ -42,6 +42,7 @@
 #include "synthesize.h"           // for PHONEME_LIST2, N_PHONEME_LIST, PHON...
 #include "ucd/ucd.h"              // for ucd_toupper
 #include "voice.h"                // for voice, voice_t
+#include "speech.h"               // for MAKE_MEM_UNDEFINED
 
 Translator *translator = NULL; // the main translator
 Translator *translator2 = NULL; // secondary translator for certain words
@@ -2045,6 +2046,7 @@ void TranslateClause(Translator *tr, int *tone_out, char **voice_change)
 		}
 	}
 
+	MAKE_MEM_UNDEFINED(&ph_list2, sizeof(ph_list2));
 	memset(&ph_list2[0], 0, sizeof(ph_list2[0]));
 	ph_list2[0].phcode = phonPAUSE_SHORT;