SERIAL: Change Android methods calls as needed per c2585dc

Author: mgorges

modules/serial/ANDROID_c_additions

@@ -82,7 +82,7 @@ void serial_writechar(int dev, int val){
   JNIEnv *env = GetJNIEnv();
   if (env&&serial_object) {
     serial_timeout_set(0);
-    (*env)->CallIntMethod(env,serial_object, s_serial_writechar, dev, val);
+    (*env)->CallVoidMethod(env,serial_object, s_serial_writechar, dev, val);
   } 
 }
 int serial_readchar(int dev){
@@ -115,7 +115,7 @@ void serial_flush(int dev){
   }
   JNIEnv *env = GetJNIEnv();
   if (env&&serial_object) {
-    (*env)->CallIntMethod(env,serial_object, s_serial_flush, dev);
+    (*env)->CallVoidMethod(env,serial_object, s_serial_flush, dev);
   }
 }
 int serial_getDTR(int dev){
@@ -136,7 +136,7 @@ void serial_setDTR(int dev, int val){
   }
   JNIEnv *env = GetJNIEnv();
   if (env&&serial_object) {
-    (*env)->CallIntMethod(env,serial_object, s_serial_setdtr, dev, val);
+    (*env)->CallVoidMethod(env,serial_object, s_serial_setdtr, dev, val);
   }
 }
 int serial_getRTS(int dev){
@@ -157,7 +157,7 @@ void serial_setRTS(int dev, int val){
   }
   JNIEnv *env = GetJNIEnv();
   if (env&&serial_object) {
-    (*env)->CallIntMethod(env,serial_object, s_serial_setrts, dev, val);
+    (*env)->CallVoidMethod(env,serial_object, s_serial_setrts, dev, val);
   }
 }
 int serial_openfile(char *filepath){