eliminated warnings in Hrs3300

Author: nscooling

src/drivers/Hrs3300.cpp

@@ -70,13 +70,14 @@ uint16_t Hrs3300::ReadAls() {
 }
 
 void Hrs3300::SetGain(uint8_t gain) {
-  static constexpr uint8_t maxGain = 64;
+  constexpr uint8_t maxGain = 64U;
   gain = std::min(gain, maxGain);
   uint8_t hgain = 0;
-  while((1 << hgain) < gain)
-    hgain++;
+  while((1 << hgain) < gain){
+    ++hgain;
+  }
 
-    WriteRegister(static_cast<uint8_t>(Registers::Hgain), hgain << 2);
+  WriteRegister(static_cast<uint8_t>(Registers::Hgain), hgain << 2);
 }
 
 void Hrs3300::SetDrive(uint8_t drive) {