Do not sign extend lwu, by Aurelien Jarno.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2889 c046a42c-6fe2-441c-8c8c-71466251a162

target-mips/op_mem.c

@@ -63,7 +63,7 @@ void glue(op_lw, MEMSUFFIX) (void)
 
 void glue(op_lwu, MEMSUFFIX) (void)
 {
-    T0 = glue(ldl, MEMSUFFIX)(T0);
+    T0 = (uint32_t)glue(ldl, MEMSUFFIX)(T0);
     RETURN();
 }