print memdebug to stderr

memory usage tracing outputs are debug info, so it should be moved to
stderr instead of stdout.

Signed-off-by: Dave Young <dyoung@redhat.com>

modules.d/99base/dracut-lib.sh

@@ -1041,7 +1041,7 @@ make_trace_mem()
     msg="$1"
     shift
     if [ -n "$DEBUG_MEM_LEVEL" ] && [ "$DEBUG_MEM_LEVEL" -gt 0 ]; then
-        make_trace show_memstats $DEBUG_MEM_LEVEL "[debug_mem]" "$msg" "$@"
+        make_trace show_memstats $DEBUG_MEM_LEVEL "[debug_mem]" "$msg" "$@" >&2
     fi
 }