net/9p: use macro to define default msize

Use a macro to define the default value for the 'msize' option
at one place instead of using two separate integer literals.

Link: http://lkml.kernel.org/r/28bb651ae0349a7d57e8ddc92c1bd5e62924a912.1630770829.git.linux_oss@crudebyte.com
Signed-off-by: Christian Schoenebeck <linux_oss@crudebyte.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>

net/9p/client.c

@@ -30,6 +30,8 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/9p.h>
 
+#define DEFAULT_MSIZE 8192
+
 /*
   * Client Option Parsing (code inspired by NFS code)
   *  - a little lazy - parse all client options
@@ -65,7 +67,7 @@ EXPORT_SYMBOL(p9_is_proto_dotu);
 
 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
 {
-	if (clnt->msize != 8192)
+	if (clnt->msize != DEFAULT_MSIZE)
 		seq_printf(m, ",msize=%u", clnt->msize);
 	seq_printf(m, ",trans=%s", clnt->trans_mod->name);
 
@@ -139,7 +141,7 @@ static int parse_opts(char *opts, struct p9_client *clnt)
 	int ret = 0;
 
 	clnt->proto_version = p9_proto_2000L;
-	clnt->msize = 8192;
+	clnt->msize = DEFAULT_MSIZE;
 
 	if (!opts)
 		return 0;