procd: allow adding empty strings to arrays

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

Backport of r42456

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42458 3c298f89-4303-0410-b956-a3cf2f4a3e73
atheros: enable the low_mem flag to better deal with 16M RAM devices

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

Backport of r42460

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42461 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: ack completed tx descriptors only after the full frame has been completed

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

Backport of r42457

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42475 3c298f89-4303-0410-b956-a3cf2f4a3e73