libtracefs: Remove dummy tep_vwarning() from unit tests

As the trace libraries have log levels, there is no need to implement a
dummy log function in order to silence the libraries logs.

Link: https://lore.kernel.org/linux-trace-devel/20210507095154.1080202-4-tz.stoyanov@gmail.com

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
diff --git a/utest/trace-utest.c b/utest/trace-utest.c
index ee11826..58d4d4e 100644
--- a/utest/trace-utest.c
+++ b/utest/trace-utest.c
@@ -19,11 +19,6 @@
 	RUN_ALL		= 0xFFFF
 };
 
-int tep_vwarning(const char *name, const char *fmt, va_list ap)
-{
-	return 0;
-}
-
 static void print_help(char **argv)
 {
 	printf("Usage: %s [OPTIONS]\n", basename(argv[0]));