Fix compiler warning.

src/nvcore/Debug.cpp

@@ -586,7 +586,7 @@ namespace
         writeStackTrace(trace, size, 1, lines);
 
         for (uint i = 0; i < lines.count(); i++) {
-            nvDebug(lines[i]);
+            nvDebug("%s", lines[i]);
             delete lines[i];
         }
 
@@ -992,7 +992,7 @@ void debug::dumpInfo()
         writeStackTrace(trace, size, 1, lines);
 
         for (uint i = 0; i < lines.count(); i++) {
-            nvDebug(lines[i]);
+            nvDebug("%s", lines[i]);
             delete lines[i];
         }
     }