Return early. NFC.

We don't need to handle an object file having more than one symbol table,
so as soon as we find the first one, we can process it and then return
from the function.

llvm-svn: 326977

lld/ELF/InputFiles.cpp

@@ -1164,6 +1164,7 @@ template <class ELFT> void LazyObjFile::addElfSymbols() {
       if (Sym.st_shndx != SHN_UNDEF)
         Symtab->addLazyObject<ELFT>(CHECK(Sym.getName(StringTable), this),
                                     *this);
+    return;
   }
 }