ring-buffer: Correct a grammatical error in a comment

The word "trace" begins with a consonant sound,
so "a" should be used instead of "an".

Link: https://lore.kernel.org/[email protected]
Signed-off-by: liujing <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

Author: liujing

kernel/trace/ring_buffer.c

@@ -4060,7 +4060,7 @@ static const char *show_irq_str(int bits)
 	return type[bits];
 }
 
-/* Assume this is an trace event */
+/* Assume this is a trace event */
 static const char *show_flags(struct ring_buffer_event *event)
 {
 	struct trace_entry *entry;