mtp: Address clang compilation errors

* Move default value of debug_enabled to declaration
* Set more-correct fake values for MtpProperty sets

Change-Id: Ife3c15ac6c908848c16a609e8e505336e53c19d8

mtp/mtp_MtpDatabase.cpp

@@ -836,8 +836,8 @@ MtpProperty* MyMtpDatabase::getDevicePropertyDesc(MtpDeviceProperty property) {
 
 			// get current value
 			// TODO: add actual values
-			result->setCurrentValue('\0');
-			result->setDefaultValue('\0');
+			result->setCurrentValue(0);
+			result->setDefaultValue(0);
 			break;
 		}
 

mtp/twrpMtp.cpp

@@ -68,7 +68,7 @@ int main(int argc, char* argv[]) {
 }
 #endif //def TWRPMTP
 
-twrpMtp::twrpMtp(int debug_enabled = 0) {
+twrpMtp::twrpMtp(int debug_enabled) {
 	if (debug_enabled)
 		MtpDebug::enableDebug();
 	mtpstorages = new storages;

mtp/twrpMtp.hpp

@@ -33,7 +33,7 @@
 
 class twrpMtp {
 	public:
-		twrpMtp(int debug_enabled /* = 0 */);
+		twrpMtp(int debug_enabled = 0);
 		pthread_t threadserver(void);
 		pid_t forkserver(int mtppipe[2]);
 		void addStorage(std::string display, std::string path, int mtpid, uint64_t maxFileSize);