Remove/fix unused stuff and other warnings

user/fs/tree.c

@@ -3,7 +3,7 @@
 #include <ulib.h>
 
 int showtree(char *root, int indent) {
-  #define INDENT() for (size_t i = 0; i < indent; i++) uprintf(" ")
+  #define INDENT() for (size_t i = 0; i < (size_t)indent; i++) uprintf(" ")
 
   FsStat statbuf; ZERO(&statbuf);
   if (fs_stat(root, &statbuf) != E_OK) {

user/pctl/ls.c

@@ -32,7 +32,7 @@ void pctl_ls(void) {
   char *membuf = umalloc(20);
   
   uprintf("%-30s %s %-15s %-8s\n", "NAME", "PID", "MEMORY", "STATE");
-  for (size_t i = 0; i < procslen; i++) {
+  for (size_t i = 0; i < (size_t)procslen; i++) {
     ProcStat stat; ZERO(&stat);
 
     string_memset(namebuf, 0, 34);
@@ -45,7 +45,7 @@ void pctl_ls(void) {
         continue;
       }
 
-      if (PCTL_LS_CONFIG.pid != -1 && stat.pid != PCTL_LS_CONFIG.pid) {
+      if (PCTL_LS_CONFIG.pid != -1 && stat.pid != (uint64_t)PCTL_LS_CONFIG.pid) {
         continue;
       }
 

user/tb/interp.c

@@ -238,6 +238,5 @@ next:
     line = string_tokenizealloc(NULL, "\n");
   }
 
-done:
   return ok;
 }

user/tb/runtime.c

@@ -79,6 +79,7 @@ bool rt_mkalias(Token *tks) {
 }
 
 bool rt_PID(Token *tks) {
+  (void)tks;
   uprintf("%lu\n", PID);
   return true;
 }