Disassembler symbol lookup fix

Fix function signature for userspace disassembler symbol lookup.

Signed-off-by: Paul Brook <paul@codesourcery.com>
diff --git a/disas.h b/disas.h
index 06abab2..6a9332d 100644
--- a/disas.h
+++ b/disas.h
@@ -22,7 +22,11 @@
 struct elf32_sym;
 struct elf64_sym;
 
+#if defined(CONFIG_USER_ONLY)
+typedef const char *(*lookup_symbol_t)(struct syminfo *s, target_ulong orig_addr);
+#else
 typedef const char *(*lookup_symbol_t)(struct syminfo *s, target_phys_addr_t orig_addr);
+#endif
 
 struct syminfo {
     lookup_symbol_t lookup_symbol;