Fix the following compilation warning:

arch/x86/platform/olpc/olpc_dt.c: In function ‘olpc_dt_compatible_match’:
arch/x86/platform/olpc/olpc_dt.c:222:12: warning: variable ‘len’ set but
not used [-Wunused-but-set-variable]
  222 |  int plen, len;

The local variable len is set but never used, so remove it.

Fixes: a7a9bacb9a32 ("x86/platform/olpc: Use a correct version when making up a battery node")
Signed-off-by: Zeng Heng <zengheng4@huawei.com>
---
 arch/x86/platform/olpc/olpc_dt.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/platform/olpc/olpc_dt.c b/arch/x86/platform/olpc/olpc_dt.c
index 74ebd6882690..1b91702e89a3 100644
--- a/arch/x86/platform/olpc/olpc_dt.c
+++ b/arch/x86/platform/olpc/olpc_dt.c
@@ -219,13 +219,12 @@ static u32 __init olpc_dt_get_board_revision(void)
 static int __init olpc_dt_compatible_match(phandle node, const char *compat)
 {
 	char buf[64], *p;
-	int plen, len;
+	int plen;
 
 	plen = olpc_dt_getproperty(node, "compatible", buf, sizeof(buf));
 	if (plen <= 0)
 		return 0;
 
-	len = strlen(compat);
 	for (p = buf; p < buf + plen; p += strlen(p) + 1) {
 		if (strcmp(p, compat) == 0)
 			return 1;
-- 
2.25.1