ELF linker: Increment curSymbol after filling in the fields of the current entry

The bug was introduced in a8b7cef4 which added a field to the symbols array elements and then updated this code incorrectly:

-                       oc->symbols[curSymbol++] = nm;
+                       oc->symbols[curSymbol++].name = nm;
+                       oc->symbols[curSymbol].addr = symbol->addr;