advapi32/tests: Remove dead assignment (Cppcheck)

[Bruno Jesus]

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diff --git a/dlls/advapi32/tests/security.c b/dlls/advapi32/tests/security.c
index b44496a..04a88ae 100644
--- a/dlls/advapi32/tests/security.c
+++ b/dlls/advapi32/tests/security.c
@@ -920,7 +920,6 @@ cleanup:
     rc &= ~(FILE_ATTRIBUTE_NOT_CONTENT_INDEXED|FILE_ATTRIBUTE_COMPRESSED);
     ok(rc == FILE_ATTRIBUTE_ARCHIVE, "expected FILE_ATTRIBUTE_ARCHIVE got %#x\n", rc);
 
-    retSize = 0xdeadbeef;
     rc = GetFileSecurityA(file, OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION|DACL_SECURITY_INFORMATION,
                           NULL, 0, &sdSize);
     ok(!rc, "GetFileSecurity should fail\n");