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ip/tftpd: fix %.*s format for homedir path

--- a/sys/src/cmd/ip/tftpd.c

+++ b/sys/src/cmd/ip/tftpd.c

@@ -145,7 +145,7 @@

 	dirsllen = strlen(homedir);

 	while(dirsllen > 0 && homedir[dirsllen-1] == '/')

 		dirsllen--;

-	dirsl = smprint("%.*s/", dirsllen, homedir);

+	dirsl = smprint("%.*s/", utfnlen(homedir, dirsllen), homedir);

 	fmtinstall('E', eipfmt);

 	fmtinstall('I', eipfmt);