bpf/tests: Fix error in tail call limit tests

This patch fixes an error in the tail call limit test that caused the
test to fail on for x86-64 JIT. Previously, the register R0 was used to
report the total number of tail calls made. However, after a tail call
fall-through, the value of the R0 register is undefined. Now, all tail
call error path tests instead use context state to store the count.

Fixes: 874be05f525e ("bpf, tests: Add tail call test suite")
Reported-by: Paul Chaignon <[email protected]>
Reported-by: Tiezhu Yang <[email protected]>
Signed-off-by: Johan Almbladh <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Tested-by: Tiezhu Yang <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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