bpf, tests: Fix spelling mistake "shoft" -> "shift"

There is a spelling mistake in a literal string. Fix it.

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Daniel Borkmann <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

lib/test_bpf.c

···
 		{ { 0, -1 } }
 	},
 	{
-		"ALU64_ARSH_K: Zero shoft",
+		"ALU64_ARSH_K: Zero shift",
 		.u.insns_int = {
 			BPF_LD_IMM64(R0, 0x8123456789abcdefLL),
 			BPF_ALU64_IMM(BPF_ARSH, R0, 0),