fsx was calling vfprintf twice without resetting the va_list argument

Merge of master-melb:xfs-cmds:28212a by kenmcd.

  fsx was calling vfprintf twice without resetting the va_list argument and
  this caused a segfault on the second call.  Now uses one call to vsnprintf
  to print to a buffer and uses that multiple times.

ltp/fsx.c

@@ -153,16 +153,20 @@ warn(const char * fmt, ...)  {
 	va_end(ap);
 }
 
+#define BUF_SIZE 1024
+
 void
 prt(char *fmt, ...)
 {
 	va_list args;
+	char buffer[BUF_SIZE];
 
 	va_start(args, fmt);
-	vfprintf(stdout, fmt, args);
-	if (fsxlogf)
-		vfprintf(fsxlogf, fmt, args);
+	vsnprintf(buffer, BUF_SIZE, fmt, args);
 	va_end(args);
+	fprintf(stdout, buffer);
+	if (fsxlogf)
+		fprintf(fsxlogf, buffer);
 }
 
 void