redhat: Test tmp file before deleting

Prarit Bhargavarequested to merge
prarit/kernel-ark:tmp_btf_fig into os-build

If BTF is not enabled in the kernel config then .tmp_vmlinux.btf will not
exist. The rpm build will throw an error because the file doesn't exist.

Test for the existence of .tmp_vmlinux.btf before deleting it.

Reported by: stan upaitag@zoho.com
Signed-off-by: Prarit Bhargava prarit@redhat.com

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