Some fixes found by gcc 8

cores/esp32/esp32-hal-i2c.c

@@ -1142,7 +1142,7 @@ i2c_err_t i2cProcQueue(i2c_t * i2c, uint32_t *readCount, uint16_t timeOutMillis)
         if(tdq->ctrl.addrReq ==2) { // 10bit address
             taddr =((tdq->ctrl.addr >> 7) & 0xFE)
                    |tdq->ctrl.mode;
-            taddr = (taddr <<8) || (tdq->ctrl.addr&0xFF);
+            taddr = (taddr <<8) | (tdq->ctrl.addr&0xFF);
         } else { // 7bit address
             taddr =  ((tdq->ctrl.addr<<1)&0xFE)
                      |tdq->ctrl.mode;

cores/esp32/esp32-hal-time.c

@@ -17,9 +17,9 @@
 
 static void setTimeZone(long offset, int daylight)
 {
-    char cst[16] = {0};
-    char cdt[16] = "DST";
-    char tz[32] = {0};
+    char cst[17] = {0};
+    char cdt[17] = "DST";
+    char tz[33] = {0};
 
     if(offset % 3600){
         sprintf(cst, "UTC%ld:%02u:%02u", offset / 3600, abs((offset % 3600) / 60), abs(offset % 60));