Index: arm-semi.c
===================================================================
--- arm-semi.c	(revision 4807)
+++ arm-semi.c	(working copy)
@@ -362,6 +362,7 @@
                 return (uint32_t)-1;
             ret = set_swi_errno(ts, system(s));
             unlock_user(s, ARG(0), 0);
+            return ret;
         }
     case SYS_ERRNO:
 #ifdef CONFIG_USER_ONLY