A minor change to avoid a warning in visual studio.

6b745361 · Davis King · 0b88840f · 6b745361
Commit 6b745361 authored Dec 28, 2012 by Davis King
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dlib/assert.h dlib/assert.h +3 -1

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--- a/dlib/assert.h
+++ b/dlib/assert.h
@@ -56,7 +56,9 @@ namespace dlib
 #if !defined(DLIB_DISABLE_ASSERTS) && ( defined DEBUG || defined _DEBUG)
    // make sure ENABLE_ASSERTS is defined if we are indeed using them.
-    #define ENABLE_ASSERTS
+    #ifndef ENABLE_ASSERTS
+        #define ENABLE_ASSERTS
+    #endif
 #endif
 // -----------------------------