[ELF] - Use early return. NFC.
[ELF] - Use early return. NFC.

This addresses forgotten review comment for r280067:
"[ELF] - Versionscript: support wildcards for extern "c++" tag."


git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@280068 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld