net: filter: Avoid shadowing variable in bpf_convert_ctx_access()

Rename the local variable 'off' to 'offset' to avoid shadowing the existing
'off' variable that is declared as an `int` in the outer scope of
bpf_convert_ctx_access().

This fixes a compiler warning:

 net/core/filter.c:9679:8: warning: declaration shadows a local variable [-Wshadow]

Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://patch.msgid.link/20250228-fix_filter-v1-1-ce13eae66fe9@debian.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Author: leitao

net/core/filter.c

@@ -9637,7 +9637,7 @@ static u32 bpf_convert_ctx_access(enum bpf_access_type type,
 
 	case offsetof(struct __sk_buff, queue_mapping):
 		if (type == BPF_WRITE) {
-			u32 off = bpf_target_off(struct sk_buff, queue_mapping, 2, target_size);
+			u32 offset = bpf_target_off(struct sk_buff, queue_mapping, 2, target_size);
 
 			if (BPF_CLASS(si->code) == BPF_ST && si->imm >= NO_QUEUE_MAPPING) {
 				*insn++ = BPF_JMP_A(0); /* noop */
@@ -9646,7 +9646,7 @@ static u32 bpf_convert_ctx_access(enum bpf_access_type type,
 
 			if (BPF_CLASS(si->code) == BPF_STX)
 				*insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1);
-			*insn++ = BPF_EMIT_STORE(BPF_H, si, off);
+			*insn++ = BPF_EMIT_STORE(BPF_H, si, offset);
 		} else {
 			*insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
 					      bpf_target_off(struct sk_buff,