code cleanup: fix variables initialization

src/libespeak-ng/langopts.c

 			break;
 		}
             case V_TUNES: {
-				char names[6][40] = { 0, 0, 0, 0, 0, 0 };
+				char names[6][40] = { {0}, {0}, {0}, {0}, {0}, {0} };
                 n = sscanf(keyValue, "%s %s %s %s %s %s", names[0], names[1], names[2], names[3], names[4], names[5]);
                 translator->langopts.intonation_group = 0;
 

src/libespeak-ng/readclause.c

 	int c1 = ' '; // current character
 	int c2; // next character
 	int cprev = ' '; // previous character
-	int c_next;
+	int c_next = 0;
 	int parag;
 	int ix = 0;
 	int j;

src/speechPlayer/src/frame.cpp

 
 	public:
 
-	FrameManagerImpl(): curFrame(), curFrameIsNULL(true), sampleCounter(0), newFrameRequest(NULL), lastUserIndex(-1)  {
+	FrameManagerImpl(): newFrameRequest(NULL), curFrame(), curFrameIsNULL(true), sampleCounter(0), lastUserIndex(-1)  {
 		oldFrameRequest=new frameRequest_t();
 		oldFrameRequest->NULLFrame=true;
 	}