bpf: Remove unneeded variable #21946

Job	Run time
set-matrix	1s
build for x86_64 with gcc	3m 55s
build for x86_64 with llvm-16	3m 30s
build for aarch64 with gcc	4m 6s
build for s390x with gcc	12m 30s
veristat	1m 53s
test_progs on x86_64 with gcc	4m 1s
test_progs_parallel on x86_64 with gcc	2m 47s
test_progs_no_alu32 on x86_64 with gcc	3m 26s
test_progs_no_alu32_parallel on x86_64 with gcc	2m 26s
test_maps on x86_64 with gcc	2m 36s
test_verifier on x86_64 with gcc	1m 38s
test_progs on x86_64 with llvm-16	4m 10s
test_progs_parallel on x86_64 with llvm-16	2m 48s
test_progs_no_alu32 on x86_64 with llvm-16	3m 33s
test_progs_no_alu32_parallel on x86_64 with llvm-16	2m 31s
test_maps on x86_64 with llvm-16	2m 46s
test_verifier on x86_64 with llvm-16	1m 41s
test_progs on aarch64 with gcc	4m 28s
test_progs_parallel on aarch64 with gcc	2m 39s
test_progs_no_alu32 on aarch64 with gcc	3m 41s
test_progs_no_alu32_parallel on aarch64 with gcc	2m 28s
test_maps on aarch64 with gcc	2m 58s
test_verifier on aarch64 with gcc	1m 27s
test_progs on s390x with gcc	24m 16s
test_progs_no_alu32 on s390x with gcc	16m 25s
test_maps on s390x with gcc	48m 17s
test_verifier on s390x with gcc	5m 15s
	2h 52m 12s

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