kernel32/tests: fix a compiler warning (try 3)

[Austin English]

This time, without a newline and without using %s, since the trace is
actually dumping the buffer.

-- 
-Austin
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diff --git a/dlls/kernel32/tests/file.c b/dlls/kernel32/tests/file.c
index e2ad49d..958a664 100644
--- a/dlls/kernel32/tests/file.c
+++ b/dlls/kernel32/tests/file.c
@@ -700,7 +700,7 @@ static void dumpmem(unsigned char* mem, int len) {
             }
         }
         sprintf(buf+ln, "\n");
-        trace(buf);
+        trace(buf,"");
         ln = 0;
     }
 }