netdev: Always clear struct ifreq before ioctl. #2550

Job	Run time
libreswan (ubuntu-24.04)	5s
dpdk gcc (ubuntu-24.04)	5s
linux deb no dpdk	5m 11s
linux rpm fedora	4m 4s
osx clang --disable-ssl	1m 37s
clang-analyze	20m 19s
linux gcc --disable-ssl	3m 30s
linux clang --disable-ssl	2m 35s
linux gcc c99	2m 46s
linux clang c99	2m 43s
linux gcc test	8m 22s
linux clang address,undefined test	16m 16s
linux gcc test --enable-shared	11m 21s
linux clang test --enable-shared	10m 55s
linux gcc check check-dpdk dpdk	18m 40s
linux clang check check-dpdk dpdk	18m 36s
linux gcc test -ljemalloc	8m 50s
linux clang test -ljemalloc	9m 7s
linux gcc --enable-afxdp	2m 33s
linux clang --enable-afxdp	2m 33s
linux gcc dpdk --enable-shared	3m 47s
linux clang dpdk --enable-shared	3m 49s
linux gcc dpdk-shared	3m 8s
linux clang dpdk-shared	2m 56s
linux gcc dpdk-shared --enable-shared	3m 46s
linux clang dpdk-shared --enable-shared	3m 47s
linux gcc m32 --disable-ssl	2m 35s
linux gcc check-ovsdb-cluster	7m 2s
linux gcc check-kernel -100	10m 54s
linux gcc check-kernel 100-	15m 59s
linux clang address,undefined check-kernel -100	13m 5s
linux clang address,undefined check-kernel 100-	18m 27s
linux gcc check-offloads -100	10m 28s
linux gcc check-offloads 100-	11m 18s
linux gcc dpdk check-system-userspace	12m 7s
linux clang address,undefined dpdk check-system-userspace	15m 33s
linux gcc dpdk check-system-tso	13m 31s
linux gcc dpdk check-afxdp	12m 4s
	5h 14m 24s

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