Bluetooth: btintel_pcie: Fix REVERSE_INULL issue reported by coverity

check pdata return of skb_pull_data, instead of data.

Fixes: c2b636b3

 ("Bluetooth: btintel_pcie: Add support for PCIe transport")
Signed-off-by: Vijay Satija <vijay.satija@intel.com>
Signed-off-by: Kiran K <kiran.k@intel.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>