ANDROID: kbuild: suppress llvm-ar errors

These errors are harmless, suppress the output.

Fixes: 310afefe71 ("ANDROID: kbuild: add support for Clang LTO")
Change-Id: Ia78f2edb6aa3a93ffbca37d193f065a51f748679
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

scripts/link-vmlinux.sh

@@ -54,7 +54,7 @@ lto_lds()
 
 	if [ -n "${CONFIG_MODVERSIONS}" ]; then
 		for a in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do
-			for o in $(${AR} t $a); do
+			for o in $(${AR} t $a 2>/dev/null); do
 				if [ -f ${o}.symversions ]; then
 					cat ${o}.symversions >> .tmp_lto.lds
 				fi