[SYSTEMDS-3900] Fix corrupted I/O path for non-binary formats

Author: mboehm7

src/main/java/org/apache/sysds/runtime/instructions/cp/VariableCPInstruction.java

@@ -1060,9 +1060,6 @@ private void processWriteInstruction(ExecutionContext ec) {
 			HDFSTool.writeScalarToHDFS(ec.getScalarInput(getInput1()), fname);
 		}
 		else if( getInput1().getDataType() == DataType.MATRIX ) {
-			MatrixObject mo = ec.getMatrixObject(getInput1().getName());
-			int blen = Integer.parseInt(getInput4().getName());
-
 			if( fmt == FileFormat.MM )
 				writeMMFile(ec, fname);
 			else if( fmt == FileFormat.CSV )
@@ -1071,8 +1068,9 @@ else if(fmt == FileFormat.LIBSVM)
 				writeLIBSVMFile(ec, fname);
 			else if(fmt == FileFormat.HDF5)
 				writeHDF5File(ec, fname);
-			else {
-				// Default behavior (text, binary)
+			else { // Default behavior (text, binary)
+				MatrixObject mo = ec.getMatrixObject(getInput1().getName());
+				int blen = Integer.parseInt(getInput4().getName());
 				mo.exportData(fname, fmtStr, new FileFormatProperties(blen));
 			}
 		}