tools, bpf: Rename pr_warning to pr_warn to align with kernel logging

For kernel logging macros, pr_warning() is completely removed and
replaced by pr_warn(). By using pr_warn() in tools/lib/bpf/ for
symmetry to kernel logging macros, we could eventually drop the
use of pr_warning() in the whole kernel tree.

Signed-off-by: Kefeng Wang <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Reviewed-by: Sergey Senozhatsky <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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