bootloader: remove unsued variables

[Patrick Wildt]

Hi,

this fixes the build of sys/arch/amd64/stand with LLVM 13.

ok?

Patrick

diff --git a/sys/lib/libsa/netif.c b/sys/lib/libsa/netif.c
index d1a5e180291..79c6496878e 100644
--- a/sys/lib/libsa/netif.c
+++ b/sys/lib/libsa/netif.c
@@ -85,7 +85,7 @@ netif_match(struct netif *nif, void *machdep_hint)
 struct netif *
 netif_select(void *machdep_hint)
 {
-       int d, u, unit_done, s;
+       int d, u, s;
        struct netif_driver *drv;
        struct netif cur_if;
        static struct netif best_if;
@@ -106,7 +106,6 @@ netif_select(void *machdep_hint)
 
                for (u = 0; u < drv->netif_nifs; u++) {
                        cur_if.nif_unit = u;
-                       unit_done = 0;
 
 #ifdef NETIF_DEBUG
                        if (netif_debug)
diff --git a/sys/lib/libsa/tftp.c b/sys/lib/libsa/tftp.c
index 3eea8bbe66e..6bfca23a761 100644
--- a/sys/lib/libsa/tftp.c
+++ b/sys/lib/libsa/tftp.c
@@ -383,9 +383,6 @@ tftp_write(struct open_file *f, void *start, size_t size, 
size_t *resid)
 int
 tftp_stat(struct open_file *f, struct stat *sb)
 {
-       struct tftp_handle *tftpfile;
-       tftpfile = (struct tftp_handle *) f->f_fsdata;
-
        sb->st_mode = 0444;
        sb->st_nlink = 1;
        sb->st_uid = 0;