SPR-7943 Minor fix

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/tags/form/FormTag.java

@@ -345,10 +345,11 @@ public class FormTag extends AbstractHtmlElementTag {
 		tagWriter.forceBlock();
 
 		if (!isMethodBrowserSupported(getMethod())) {
+			String inputName = getMethodParameter();
 			String inputType = "hidden";
 			tagWriter.startTag(INPUT_TAG);
 			writeOptionalAttribute(tagWriter, TYPE_ATTRIBUTE, inputType);
-			writeOptionalAttribute(tagWriter, NAME_ATTRIBUTE, getMethodParameter());
+			writeOptionalAttribute(tagWriter, NAME_ATTRIBUTE, inputName);
 			writeOptionalAttribute(tagWriter, VALUE_ATTRIBUTE, processFieldValue(getName(), getMethod(), inputType));
 			tagWriter.endTag();
 		}