[PATCH] powerpc: powermac adb fix udbg_adb_use_btext warning

When compiling without BOOTX_TEXT the following warning is emitted.
Fix up the definition to only be made when required.

      CC      arch/powerpc/platforms/powermac/udbg_adb.o
    .../arch/powerpc/platforms/powermac/udbg_adb.c:41: warning:
		`udbg_adb_use_btext' defined but not used
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/powermac/udbg_adb.c

@@ -38,8 +38,6 @@ static enum {
 	input_adb_cuda,
 } input_type = input_adb_none;
 
-static int udbg_adb_use_btext;
-
 int xmon_wants_key, xmon_adb_keycode;
 
 static inline void udbg_adb_poll(void)
@@ -55,6 +53,8 @@ static inline void udbg_adb_poll(void)
 }
 
 #ifdef CONFIG_BOOTX_TEXT
+
+static int udbg_adb_use_btext;
 static int xmon_adb_shiftstate;
 
 static unsigned char xmon_keytab[128] =