initialize stuctures on stack without memset(); close #350

src/load.c

@@ -248,12 +248,12 @@ mrb_load_irep(mrb_state *mrb, FILE* fp)
   unsigned char hex8[8], hcrc[4];
   unsigned char *dst, *rite_dst = NULL;
   rite_binary_header  bin_header;
-  RiteFILE ritefp, *rfp;
+  RiteFILE ritefp = { 0 };
+  RiteFILE *rfp;
 
   if ((mrb == NULL) || (fp == NULL)) {
     return MRB_DUMP_INVALID_ARGUMENT;
   }
-  memset(&ritefp, 0, sizeof(ritefp));
   ritefp.fp = fp;
   rfp = &ritefp;
 

src/time.c

@@ -239,7 +239,7 @@ time_mktime(mrb_state *mrb, mrb_int ayear, mrb_int amonth, mrb_int aday,
 	    enum mrb_timezone timezone)
 {
   time_t nowsecs;
-  struct tm nowtime;
+  struct tm nowtime = { 0 };
 
   memset(&nowtime, 0, sizeof(struct tm));
   nowtime.tm_year  = (int)ayear  - 1900;