Fix compilation warning in do_mounts.c

[Peter Chubb]

Hi,
	change_floppy() is unused if you don't have the floppy device
compiled into the kernel --- so why not #ifdef it out?

===== init/do_mounts.c 1.14 vs edited =====
--- 1.14/init/do_mounts.c	Mon May  6 02:35:44 2002
+++ edited/init/do_mounts.c	Fri May 24 15:46:28 2002
@@ -364,6 +364,7 @@
 	return sys_symlink(path + n + 5, name);
 }
 
+#if defined(BLOCK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
 static void __init change_floppy(char *fmt, ...)
 {
 	struct termios termios;
@@ -391,6 +392,7 @@
 		close(fd);
 	}
 }
+#endif
 
 #ifdef CONFIG_BLK_DEV_RAM