contrib: Open brace '{' following struct go on the same line

I found some style problems whil check the code using checkpatch.pl.
This commit fixs the issue below:
ERROR: that open brace { should be on the previous line

Signed-off-by: zhouyang <zhouyang789@huawei.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210118031004.1662363-6-zhouyang789@huawei.com>
Message-Id: <20210213130325.14781-9-alex.bennee@linaro.org>
diff --git a/contrib/plugins/howvec.c b/contrib/plugins/howvec.c
index 9d6fa33..600f7fa 100644
--- a/contrib/plugins/howvec.c
+++ b/contrib/plugins/howvec.c
@@ -145,8 +145,7 @@
     int table_sz;
 } ClassSelector;
 
-static ClassSelector class_tables[] =
-{
+static ClassSelector class_tables[] = {
     { "aarch64", aarch64_insn_classes, ARRAY_SIZE(aarch64_insn_classes) },
     { "sparc",   sparc32_insn_classes, ARRAY_SIZE(sparc32_insn_classes) },
     { "sparc64", sparc64_insn_classes, ARRAY_SIZE(sparc64_insn_classes) },