[FileAccess] Return error codes from store_* methods.

platform/android/java/lib/src/org/godotengine/godot/io/file/AssetData.kt

@@ -145,7 +145,8 @@ internal class AssetData(context: Context, private val filePath: String, accessF
 		}
 	}
 
-	override fun write(buffer: ByteBuffer) {
+	override fun write(buffer: ByteBuffer): Boolean {
 		Log.w(TAG, "write() is not supported.")
+		return false
 	}
 }

platform/android/java/lib/src/org/godotengine/godot/io/file/DataAccess.kt

@@ -169,7 +169,7 @@ internal abstract class DataAccess {
 	abstract fun position(): Long
 	abstract fun size(): Long
 	abstract fun read(buffer: ByteBuffer): Int
-	abstract fun write(buffer: ByteBuffer)
+	abstract fun write(buffer: ByteBuffer): Boolean
 
 	fun seekFromEnd(positionFromEnd: Long) {
 		val positionFromBeginning = max(0, size() - positionFromEnd)
@@ -254,14 +254,16 @@ internal abstract class DataAccess {
 			}
 		}
 
-		override fun write(buffer: ByteBuffer) {
+		override fun write(buffer: ByteBuffer): Boolean {
 			try {
 				val writtenBytes = fileChannel.write(buffer)
 				if (writtenBytes > 0) {
 					endOfFile = false
 				}
+				return true
 			} catch (e: IOException) {
 				Log.w(TAG, "Exception while writing to file $filePath.", e)
+				return false
 			}
 		}
 	}

platform/android/java/lib/src/org/godotengine/godot/io/file/FileAccessHandler.kt

@@ -191,12 +191,12 @@ class FileAccessHandler(val context: Context) {
 		return files[fileId].read(byteBuffer)
 	}
 
-	fun fileWrite(fileId: Int, byteBuffer: ByteBuffer?) {
+	fun fileWrite(fileId: Int, byteBuffer: ByteBuffer?): Boolean {
 		if (!hasFileId(fileId) || byteBuffer == null) {
-			return
+			return false
 		}
 
-		files[fileId].write(byteBuffer)
+		return files[fileId].write(byteBuffer)
 	}
 
 	fun fileFlush(fileId: Int) {