Changed  0 --> NULL to avoid sparse warning

Sparse warning below:

sudo make C=2 CF=-D__CHECK_ENDIAN__ M=security

 CHECK   security/selinux/ss/services.c
security/selinux/ss/services.c:1323:32: warning: Using plain integer as
NULL pointer

Signed-off-by: Hariprasad Kelam <[email protected]>
---
 security/selinux/ss/services.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index ec62918..30cea59 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1320,7 +1320,7 @@ static int security_sid_to_context_core(struct 
selinux_state *state,
        }
        if (only_invalid && !context->len) {
                scontext = NULL;
-               scontext_len = 0;
+               scontext_len = NULL;
                rc = 0;
        } else {
                rc = context_struct_to_string(policydb, context, scontext,
-- 
2.7.4

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