Revert this test for now

Author: Sirraide

clang/test/Index/warning-flags.c

@@ -9,7 +9,7 @@ int *bar(float *f) { return f; }
 // RUN: c-index-test -test-load-source-reparse 5 all -w %s 2>&1 | FileCheck -check-prefix=NOWARNINGS %s
 // RUN: c-index-test -test-load-source all -w -O4 %s 2>&1 | FileCheck -check-prefix=NOWARNINGS %s
 
-// CHECK-BOTH-WARNINGS: error: non-void function does not return a value
+// CHECK-BOTH-WARNINGS: warning: non-void function does not return a value
 // CHECK-BOTH-WARNINGS: warning: incompatible pointer types returning 'float *' from a function with result type 'int *'
 
 // CHECK-SECOND-WARNING-NOT:non-void function does not return a value