gpsd: garmintxt driver gets enabled by default, so disable if not selected

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/gpsd/gpsd.mk

@@ -58,8 +58,8 @@ endif
 ifneq ($(BR2_PACKAGE_GPSD_GARMIN),y)
 	GPSD_CONF_OPT += --disable-garmin
 endif
-ifeq ($(BR2_PACKAGE_GPSD_GARMIN_SIMPLE_TXT),y)
-	GPSD_CONF_OPT += --enable-garmintxt
+ifneq ($(BR2_PACKAGE_GPSD_GARMIN_SIMPLE_TXT),y)
+	GPSD_CONF_OPT += --disable-garmintxt
 endif
 ifneq ($(BR2_PACKAGE_GPSD_GPSCLOCK),y)
 	GPSD_CONF_OPT += --disable-gpsclock