Quote $_commit variables

Also change $_hash and $_rev to $_commit

firmware/firmware-aosp-broadcom-wlan/APKBUILD

@@ -8,7 +8,7 @@ license="proprietary"
 options="!check !strip !archcheck"
 
 # Sources
-_commit=6c8ef5b600cec5d36a54a0276fe8c97b9ab8d6bb
+_commit="6c8ef5b600cec5d36a54a0276fe8c97b9ab8d6bb"
 _url="https://github.com/zhuowei/android_hardware_broadcom_wlan"
 source=$pkgname-$_commit.tar.gz::$_url"/archive/${_commit}.tar.gz"