code review 6242061: runtime: update field types in preparation for GC changes

src/pkg/runtime/thread_freebsd.c

 // Use of this source file is governed by a BSD-style
 // license that can be found in the LICENSE file.`
 
 #include "runtime.h"
 #include "defs_GOOS_GOARCH.h"
 #include "os_GOOS.h"
 #include "stack.h"
 
 extern SigTab runtime·sigtab[];
 extern int32 runtime·sys_umtx_op(uint32*, int32, uint32, void*, void*);
@@ skipping 108 matching lines @@
 {
         runtime·goenvs_unix();
 }
 
 // Called to initialize a new m (including the bootstrap m).
 void
 runtime·minit(void)
 {
         // Initialize signal handling
         m->gsignal = runtime·malg(32*1024);
-        runtime·signalstack(m->gsignal->stackguard - StackGuard, 32*1024);
+        runtime·signalstack((byte*)m->gsignal->stackguard - StackGuard, 32*1024);
         runtime·sigprocmask(&sigset_none, nil);
 }
 
 void
 runtime·sigpanic(void)
 {
         switch(g->sig) {
         case SIGBUS:
                 if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000) {
                         if(g->sigpc == 0)
@@ skipping 68 matching lines @@
 
 static int8 badsignal[] = "runtime: signal received on thread not created by Go.\n";
 
 // This runs on a foreign stack, without an m or a g.  No stack split.
 #pragma textflag 7
 void
 runtime·badsignal(void)
 {
         runtime·write(2, badsignal, sizeof badsignal - 1);
 }