Misc: Unreachable code warning fixes

src/core/cdrom.cpp

@@ -879,7 +879,6 @@ u8 CDROM::ReadRegister(u32 offset)
   Log_ErrorPrintf("Unknown CDROM register read: offset=0x%02X, index=%d", offset,
                   ZeroExtend32(s_status.index.GetValue()));
   Panic("Unknown CDROM register");
-  return 0;
 }
 
 void CDROM::WriteRegister(u32 offset, u8 value)

src/core/cpu_recompiler_code_generator.cpp

@@ -274,7 +274,6 @@ Value CodeGenerator::ConvertValueSize(const Value& value, RegSize size, bool sig
     }
 
     UnreachableCode();
-    return Value{};
   }
 
   Value new_value = m_register_cache.AllocateScratch(size);
@@ -330,7 +329,6 @@ void* CodeGenerator::GetCurrentCodePointer() const
     return GetCurrentFarCodePointer();
 
   Panic("unknown emitter");
-  return nullptr;
 }
 
 Value CodeGenerator::AddValues(const Value& lhs, const Value& rhs, bool set_flags)
@@ -2480,7 +2478,6 @@ bool CodeGenerator::Compile_Branch(const CodeBlockInstruction& cbi)
       else
       {
         UnreachableCode();
-        return false;
       }
     }
 
@@ -2549,7 +2546,6 @@ bool CodeGenerator::Compile_Branch(const CodeBlockInstruction& cbi)
 
     default:
       UnreachableCode();
-      return false;
   }
 }
 

src/core/digital_controller.cpp

@@ -133,10 +133,7 @@ bool DigitalController::Transfer(const u8 data_in, u8* data_out)
       return false;
 
     default:
-    {
       UnreachableCode();
-      return false;
-    }
   }
 }
 

src/core/gte.cpp

@@ -1356,7 +1356,6 @@ InstructionImpl GetInstructionImpl(u32 inst_bits, TickCount* ticks)
 
     default:
       Panic("Missing handler");
-      return nullptr;
   }
 }
 

src/core/guncon.cpp

@@ -175,10 +175,7 @@ bool GunCon::Transfer(const u8 data_in, u8* data_out)
     }
 
     default:
-    {
       UnreachableCode();
-      return false;
-    }
   }
 }
 

src/core/playstation_mouse.cpp

@@ -154,7 +154,6 @@ bool PlayStationMouse::Transfer(const u8 data_in, u8* data_out)
     default:
     {
       UnreachableCode();
-      return false;
     }
   }
 }