media-video/pipewire: Fix '/dev/null'": No such file or directory

Closes: https://bugs.gentoo.org/960627
Signed-off-by: Brahmajit Das <listout@listout.xyz>
Part-of: https://github.com/gentoo/gentoo/pull/43140
Closes: https://github.com/gentoo/gentoo/pull/43140
Signed-off-by: Sam James <sam@gentoo.org>

media-video/pipewire/files/gentoo-pipewire-launcher.in-r4

@@ -17,9 +17,9 @@ then
     . "${CONF}"
 fi
 
-: "${GENTOO_PIPEWIRE_LOG:='/dev/null'}"
-: "${GENTOO_PIPEWIRE_PULSE_LOG:='/dev/null'}"
-: "${GENTOO_WIREPLUMBER_LOG:='/dev/null'}"
+: "${GENTOO_PIPEWIRE_LOG:=/dev/null}"
+: "${GENTOO_PIPEWIRE_PULSE_LOG:=/dev/null}"
+: "${GENTOO_WIREPLUMBER_LOG:=/dev/null}"
 
 for L in \
     "${GENTOO_PIPEWIRE_LOG}" \