Use stdout instead of stderr in testsuite

This patches uses stdout instead stderr when giving out normal status
messages in the testsuite.

test/atexit.c

@@ -2,7 +2,7 @@
 #include <unistd.h>
 
 void blah(void) {
-  write(2,"atexit\n",7);
+  write(1,"atexit\n",7);
 }
 
 int main() {

test/malloc-debugger.c

@@ -4,7 +4,7 @@
 int main() {
   char* c=malloc(13);
   char* tmp;
-  fprintf(stderr,"got %p\n",c);
+  fprintf(stdout,"got %p\n",c);
   c[0]=14;
 //  c[15]=0;
   tmp=realloc(c,12345);

test/sendfile.c

@@ -11,5 +11,5 @@ int main() {
 
   printf("sendfile returned %d\n",ret);
 
-return 0;    
+  return ret<0 ? 1 : 0;
 }

test/waitpid.c

@@ -11,7 +11,7 @@ int main() {
     perror("fork");
     _exit(1);
   case 0:
-    fprintf(stderr,"child, my pid is %u\n",getpid());
+    fprintf(stdout,"child, my pid is %u\n",getpid());
     sleep(1);
     _exit(23);
   }