sh: Fix up kgdb build with modular sh-sci.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug
index ab2f9f3..7fb6d5c 100644
--- a/arch/sh/Kconfig.debug
+++ b/arch/sh/Kconfig.debug
@@ -124,7 +124,7 @@
 
 config SH_KGDB_CONSOLE
 	bool "Console messages through GDB"
-	depends on !SERIAL_SH_SCI_CONSOLE
+	depends on !SERIAL_SH_SCI_CONSOLE && SERIAL_SH_SCI=y
 	select SERIAL_CORE_CONSOLE
 	default n