Follow-up fix for r737173 and r737238 (patch 46544) - filename arg was not properly parsed.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@737248 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/extractor/ExcelExtractor.java

@@ -89,10 +89,11 @@ public class ExcelExtractor extends POIOLE2TextExtractor implements org.apache.p
 					break;
 				}
 				if ("-i".equals(arg)) {
-					arg = args[++i]; // step to next arg
-					if (i >= nArgs) {
+					 // step to next arg
+					if (++i >= nArgs) {
 						throw new CommandParseException("Expected filename after '-i'");
 					}
+					arg = args[i];
 					if (inputFile != null) {
 						throw new CommandParseException("Only one input file can be supplied");
 					}