PCI/PTM: Fix pcie_ptm_create_debugfs() memory leak

PCI/PTM: Fix pcie_ptm_create_debugfs() memory leak

In pcie_ptm_create_debugfs(), if devm_kasprintf() fails after successfully
allocating ptm_debugfs with kzalloc(), the function returns without freeing
the allocated memory, resulting in a memory leak.

Free ptm_debugfs before returning in the devm_kasprintf() error path and in
pcie_ptm_destroy_debugfs().

Fixes: 132833405e61 ("PCI: Add debugfs support for exposing PTM context")
Signed-off-by: Aadityarangan Shridhar Iyengar <adiyenga@cisco.com>
[bhelgaas: squash additional fix from Mani:
https://lore.kernel.org/r/pdp4xc4d5ee3e547mmdro5riui3mclduqdl7j6iclfbozo2a4c@7m3qdm6yrhuv]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/20260111163650.33168-1-adiyenga@cisco.com