Minor style improvement suggested by cppcheck.

Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
 arch.c    | 4 +++-
 netlink.c | 3 +--
 tap.c     | 5 +++--
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch.c b/arch.c
index 10eb24a..a2c4562 100644
--- a/arch.c
+++ b/arch.c
@@ -25,7 +25,7 @@
 #ifdef __x86_64__
 void arch_avx2_exec(char **argv)
 {
-	char exe[PATH_MAX] = { 0 }, new_path[PATH_MAX + sizeof(".avx2")], *p;
+	char exe[PATH_MAX] = { 0 }, *p;
 
 	if (readlink("/proc/self/exe", exe, PATH_MAX - 1) < 0) {
 		perror("readlink /proc/self/exe");
@@ -37,6 +37,8 @@ void arch_avx2_exec(char **argv)
 		return;
 
 	if (__builtin_cpu_supports("avx2")) {
+		char new_path[PATH_MAX + sizeof(".avx2")];
+
 		snprintf(new_path, PATH_MAX + sizeof(".avx2"), "%s.avx2", exe);
 		execve(new_path, argv, environ);
 		perror("Can't run AVX2 build, using non-AVX2 version");
diff --git a/netlink.c b/netlink.c
index 8ad6a0c..6f7ada8 100644
--- a/netlink.c
+++ b/netlink.c
@@ -147,7 +147,6 @@ unsigned int nl_get_ext_if(sa_family_t af)
 	};
 	struct nlmsghdr *nh;
 	struct rtattr *rta;
-	struct rtmsg *rtm;
 	char buf[BUFSIZ];
 	ssize_t n;
 	size_t na;
@@ -158,7 +157,7 @@ unsigned int nl_get_ext_if(sa_family_t af)
 	nh = (struct nlmsghdr *)buf;
 
 	for ( ; NLMSG_OK(nh, n); nh = NLMSG_NEXT(nh, n)) {
-		rtm = (struct rtmsg *)NLMSG_DATA(nh);
+		struct rtmsg *rtm = (struct rtmsg *)NLMSG_DATA(nh);
 
 		if (rtm->rtm_dst_len || rtm->rtm_family != af)
 			continue;
diff --git a/tap.c b/tap.c
index 4d7422f..5540c18 100644
--- a/tap.c
+++ b/tap.c
@@ -782,12 +782,12 @@ restart:
  */
 static void tap_sock_unix_init(struct ctx *c)
 {
-	int fd = socket(AF_UNIX, SOCK_STREAM, 0), ex;
+	int fd = socket(AF_UNIX, SOCK_STREAM, 0);
 	struct epoll_event ev = { 0 };
 	struct sockaddr_un addr = {
 		.sun_family = AF_UNIX,
 	};
-	int i, ret;
+	int i;
 
 	if (fd < 0) {
 		perror("UNIX socket");
@@ -802,6 +802,7 @@ static void tap_sock_unix_init(struct ctx *c)
 
 	for (i = 1; i < UNIX_SOCK_MAX; i++) {
 		char *path = addr.sun_path;
+		int ex, ret;
 
 		if (*c->sock_path)
 			memcpy(path, c->sock_path, UNIX_PATH_MAX);
-- 
2.37.3