kernel/sys: initialize return codes when declaring variables

index 241507f..b3b2ef7 100644
@@ -1364,7 +1364,7 @@ SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name)
 
 SYSCALL_DEFINE2(sethostname, char __user *, name, int, len)
 {
-	int errno;
+	int errno = -EFAULT;
 	char tmp[__NEW_UTS_LEN];
 
 	if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN))

@@ -1373,7 +1373,6 @@ SYSCALL_DEFINE2(sethostname, char __user *, name, int, len)
 	if (len < 0 || len > __NEW_UTS_LEN)
 		return -EINVAL;
 	down_write(&uts_sem);
-	errno = -EFAULT;
 	if (!copy_from_user(tmp, name, len)) {
 		struct new_utsname *u = utsname();
 

@@ -1390,7 +1389,7 @@ SYSCALL_DEFINE2(sethostname, char __user *, name, int, len)
 
 SYSCALL_DEFINE2(gethostname, char __user *, name, int, len)
 {
-	int i, errno;
+	int i, errno = 0;
 	struct new_utsname *u;
 
 	if (len < 0)

@@ -1400,7 +1399,6 @@ SYSCALL_DEFINE2(gethostname, char __user *, name, int, len)
 	i = 1 + strlen(u->nodename);
 	if (i > len)
 		i = len;
-	errno = 0;
 	if (copy_to_user(name, u->nodename, i))
 		errno = -EFAULT;
 	up_read(&uts_sem);

@@ -1415,7 +1413,7 @@ SYSCALL_DEFINE2(gethostname, char __user *, name, int, len)
  */
 SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len)
 {
-	int errno;
+	int errno = -EFAULT;
 	char tmp[__NEW_UTS_LEN];
 
 	if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN))

@@ -1424,7 +1422,6 @@ SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len)
 		return -EINVAL;
 
 	down_write(&uts_sem);
-	errno = -EFAULT;
 	if (!copy_from_user(tmp, name, len)) {
 		struct new_utsname *u = utsname();