trace: add variant without spacing in trace_print_hex_seq

For upcoming tracepoint support for BPF, we want to dump the program's
tag. Format should be similar to __print_hex(), but without spacing.
Add a __print_hex_str() variant for exactly that purpose that reuses
trace_print_hex_seq().

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index be00761..cfa475a 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -33,7 +33,8 @@ const char *trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
 				    unsigned int bitmask_size);
 
 const char *trace_print_hex_seq(struct trace_seq *p,
-				const unsigned char *buf, int len);
+				const unsigned char *buf, int len,
+				bool spacing);
 
 const char *trace_print_array_seq(struct trace_seq *p,
 				   const void *buf, int count,