Fix file download linter warnings

examples/FileDownload/FileDownload.ino

@@ -78,13 +78,13 @@ const char wifiPass[] = "YourWiFiPass";
 const char server[] = "vsh.pp.ua";
 const int  port = 80;
 
+#include <TinyGsmClient.h>
+#include <CRC32.h>
+
 const char resource[]  = "/TinyGSM/test_1k.bin";
 uint32_t knownCRC32    = 0x6f50d767;
 uint32_t knownFileSize = 1024;   // In case server does not send it
 
-#include <TinyGsmClient.h>
-#include <CRC32.h>
-
 #ifdef DUMP_AT_COMMANDS
   #include <StreamDebugger.h>
   StreamDebugger debugger(SerialAT, SerialMon);
@@ -123,7 +123,7 @@ void setup() {
 
 void printPercent(uint32_t readLength, uint32_t contentLength) {
   // If we know the total length
-  if (contentLength != -1) {
+  if (contentLength != (uint32_t)-1) {
     SerialMon.print("\r ");
     SerialMon.print((100.0 * readLength) / contentLength);
     SerialMon.print('%');

src/TinyGsmClientSIM800.h

@@ -711,9 +711,12 @@ TINY_GSM_MODEM_WAIT_FOR_NETWORK()
     return true;
   }
 
+  float getTemperature() TINY_GSM_ATTR_NOT_AVAILABLE;
+
   /*
    * NTP server functions
    */
+
   boolean isValidNumber(String str) {
     if(!(str.charAt(0) == '+' || str.charAt(0) == '-' || isDigit(str.charAt(0)))) return false;
 
@@ -743,7 +746,6 @@ TINY_GSM_MODEM_WAIT_FOR_NETWORK()
   }
 
   byte NTPServerSync(String server = "pool.ntp.org", byte TimeZone = 3) {
-    //Serial.println("Sync time with NTP server.");
     sendAT(GF("+CNTPCID=1"));
     if (waitResponse(10000L) != 1) {
         return -1;
@@ -769,8 +771,6 @@ TINY_GSM_MODEM_WAIT_FOR_NETWORK()
     return -1;
   }
 
-  float getTemperature() TINY_GSM_ATTR_NOT_AVAILABLE;
-
   /*
    * Client related functions
    */