[llvm-readobj] Fix another "time of check to time of use bug".

It seems there's more copy-paste between tools than needed.

llvm-svn: 247954
diff --git a/llvm/test/tools/llvm-readobj/basic.test b/llvm/test/tools/llvm-readobj/basic.test
new file mode 100644
index 0000000..fc6349b
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/basic.test
@@ -0,0 +1,2 @@
+RUN: not llvm-readobj %t.blah 2>&1 | FileCheck --check-prefix=ENOENT %s
+ENOENT: {{.*}}.blah: {{[Nn]}}o such file or directory