Ensure all source code end with one and only one newline

by this command:
git ls-files -z | while IFS= read -rd '' f; do tail -c1 < "$f" | read -r _ || echo >> "$f"; done

binfmt/binfmt_execsymtab.c

@@ -167,4 +167,4 @@ void exec_setsymtab(FAR const struct symtab_s *symtab, int nsymbols)
   leave_critical_section(flags);
 }
 
-#endif /* CONFIG_LIBC_EXECFUNCS */
+#endif /* CONFIG_LIBC_EXECFUNCS */