x86/platform/olpc: Remove unused variable 'len' in olpc_dt_compatible_match()

The following build warning highlights some unused code:

  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]

The compiler is right, the local variable 'len' is set but never used,
so remove it.

Fixes: a7a9bac ("x86/platform/olpc: Use a correct version when making up a battery node")
Signed-off-by: Zeng Heng <zengheng4@huawei.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20241025074203.1921344-1-zengheng4@huawei.com

Author: henryZe

arch/x86/platform/olpc/olpc_dt.c

@@ -215,13 +215,12 @@ 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;