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fs: strip trailing suffix during version negotiation

This is needed to downgrade 9p2000.L to 9p2000 for the linux v9fs
client, and is also documented in version(5).

--- a/fs.c

+++ b/fs.c

@@ -535,8 +535,12 @@

 fsversion(Fmsg *m, int *msz)

 {

 	Fcall r;

+	char *p;

 	memset(&r, 0, sizeof(Fcall));

+	p = strchr(m->version, '.');

+	if(p != nil)

+		*p = '\0';

 	if(strcmp(m->version, "9P2000") == 0){

 		if(m->msize < *msz)

 			*msz = m->msize;