linux: fix typo in status printout

Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>

target/linux/Makefile.in.advanced

@@ -499,7 +499,7 @@ linux-status:
 	@echo BR2_PACKAGE_LINUX_USE_XCONFIG=$(BR2_PACKAGE_LINUX_USE_XCONFIG)
 	@echo BR2_PACKAGE_LINUX_KCONFIG=$(BR2_PACKAGE_LINUX_KCONFIG)
 	@echo BR2_LINUX_COPYTO_ROOTFS=$(BR2_LINUX_COPYTO_ROOTFS)
-	@echo BR2_LINUX_COPYTO_TFTPBOOT=$(BR2_LINUX_COPYTO_TFTPBOOT=)
+	@echo BR2_LINUX_COPYTO_TFTPBOOT=$(BR2_LINUX_COPYTO_TFTPBOOT)
 	@echo BR2_LINUX_COPYTO=$(BR2_LINUX_COPYTO)
 	@echo LINUX_COPYTO=$(LINUX_COPYTO)
 	@echo BR2_KERNEL_MINORLEVEL=$(BR2_KERNEL_MINORLEVEL)