[POWERPC] fix showing xmon help

In some configuration, xmon help string is larger than xmon_printf
buffer.  We need not to use printf.  This patch adds xmon_puts and
change to use it to show help string.

Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/xmon/nonstdio.c b/arch/powerpc/xmon/nonstdio.c
index 7876583..bfac84f 100644
--- a/arch/powerpc/xmon/nonstdio.c
+++ b/arch/powerpc/xmon/nonstdio.c
@@ -132,3 +132,8 @@
 	va_end(args);
 	xmon_write(xmon_outbuf, n);
 }
+
+void xmon_puts(const char *str)
+{
+	xmon_write(str, strlen(str));
+}
diff --git a/arch/powerpc/xmon/nonstdio.h b/arch/powerpc/xmon/nonstdio.h
index 22ec1bb..23dd95f 100644
--- a/arch/powerpc/xmon/nonstdio.h
+++ b/arch/powerpc/xmon/nonstdio.h
@@ -5,6 +5,7 @@
 
 extern int xmon_putchar(int c);
 extern int xmon_getchar(void);
+extern void xmon_puts(const char *);
 extern char *xmon_gets(char *, int);
 extern void xmon_printf(const char *, ...);
 extern void xmon_map_scc(void);
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 669e656..121b04d 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -833,7 +833,7 @@
 			mdelay(2000);
 			return cmd;
 		case '?':
-			printf(help_string);
+			xmon_puts(help_string);
 			break;
 		case 'b':
 			bpt_cmds();