ring-buffer: Report header_page overwrite as char

The header_page tracefs metadata currently reports overwrite as an
int field with size 1. That makes parsers warn about a type and
size mismatch even though the field is only used as a one-byte flag
within commit.

Keep the shared offset with commit as-is, but report overwrite as
char so the declared type matches the hardcoded size. The signedness
is already carried separately by the emitted signed field.

Link: https://patch.msgid.link/20260406165333.46052-1-create0818@163.com
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216999
Signed-off-by: Cao Ruichuang <create0818@163.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Author: RichardCao

kernel/trace/ring_buffer.c

@@ -597,11 +597,11 @@ int ring_buffer_print_page_header(struct trace_buffer *buffer, struct trace_seq
 			 (unsigned int)sizeof(field.commit),
 			 (unsigned int)is_signed_type(long));
 
-	trace_seq_printf(s, "\tfield: int overwrite;\t"
+	trace_seq_printf(s, "\tfield: char overwrite;\t"
 			 "offset:%u;\tsize:%u;\tsigned:%u;\n",
 			 (unsigned int)offsetof(typeof(field), commit),
 			 1,
-			 (unsigned int)is_signed_type(long));
+			 (unsigned int)is_signed_type(char));
 
 	trace_seq_printf(s, "\tfield: char data;\t"
 			 "offset:%u;\tsize:%u;\tsigned:%u;\n",