portaudio: fix dependency on alsa-lib

BR2_PACKAGE_PORTAUDIO_ALSA is misspelled in one place, resulting in
alsa-lib not being listed in the dependencies.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/portaudio/portaudio.mk

@@ -13,7 +13,7 @@ PORTAUDIO_LICENSE = portaudio license (MIT-like plus special clause)
 PORTAUDIO_LICENSE_FILES = LICENSE.txt
 
 PORTAUDIO_DEPENDENCIES = \
-	$(if $(BR2_PACKAGE_PORTAUDIO_WITH_ALSA),alsa-lib)
+	$(if $(BR2_PACKAGE_PORTAUDIO_ALSA),alsa-lib)
 
 PORTAUDIO_CONF_OPTS = \
 	$(if $(BR2_PACKAGE_PORTAUDIO_ALSA),--with-alsa,--without-alsa) \