Mempolicy: fix mpol_to_str() to handle ignore mode flags

Against: 2.6.25-rc8-mm1

Fixes problem introduced by my previous patch:
mempolicy-use-mpol_f_local-to-indicate-preferred-local-policy.patch

Eliminate display of bogus '=' flag indicator in presence of internal mode flags.

Without this fix, on 25-rc8-mm1, a display of a process' numa_maps will show, e.g., default policy as "default=". Worse, if the maps include longer policies, such as "interleave:0-3", this problem will lose the string terminator after the "<mode>=" and display subsequent default policies as "default=ve:0-3".

 mm/mempolicy.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.25-rc8-mm2/mm/mempolicy.c
===================================================================
@@ -2149,7 +2149,7 @@ int mpol_to_str(char *buffer, int maxlen
 	strcpy(p, policy_types[mode]);
 	p += l;
 
-	if (flags) {
+	if (flags & MPOL_MODE_FLAGS) {
 		if (buffer + maxlen < p + 2)
 			return -ENOSPC;
 		*p++ = '=';

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