Remove redundant xmllint check

Author: rpatel321

llvm/utils/lit/tests/xunit-output-report-failures-only.py

@@ -1,15 +1,11 @@
-# UNSUPPORTED: system-windows
-
 ## Check xunit output.
 # RUN: rm -rf %t.xunit.xml
 # RUN: not %{lit} --report-failures-only --xunit-xml-output %t.xunit.xml %{inputs}/xunit-output
-# If xmllint is installed verify that the generated xml is well-formed
-# RUN: sh -c 'if command -v xmllint 2>/dev/null; then xmllint --noout %t.xunit.xml; fi'
-# RUN: FileCheck < %t.xunit.xml %s
+# RUN: FileCheck --input-file=%t.xunit.xml %s
 
 # CHECK:      <?xml version="1.0" encoding="UTF-8"?>
 # CHECK-NEXT: <testsuites time="{{[0-9.]+}}">
-# CHECK-NEXT: <testsuite name="test-data" tests="5" failures="1" skipped="3" time="{{[0-9.]+}}">
+# CHECK-NEXT: <testsuite name="test-data" tests="1" failures="1" skipped="0" time="{{[0-9.]+}}">
 # CHECK-NEXT: <testcase classname="test-data.test-data" name="bad&amp;name.ini" time="{{[0-1]\.[0-9]+}}">
 # CHECK-NEXT:   <failure><![CDATA[& < > ]]]]><![CDATA[> &"]]></failure>
 # CHECK-NEXT: </testcase>