tc: Fix typo in check for colored output

The check used binary instead of boolean AND, which means colored output
was enabled only if the number of specified '-color' flags was odd.

Fixes: 2d165c0811 ("tc: implement color output")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: David Ahern <dsahern@gmail.com>

tc/tc.c

@@ -518,7 +518,7 @@ int main(int argc, char **argv)
 
 	_SL_ = oneline ? "\\" : "\n";
 
-	if (color & !json)
+	if (color && !json)
 		enable_color();
 
 	if (batch_file)