The commit cited below replaced rdma_create_ah with
mlx4_ib_create_slave_ah when creating AHs for the paravirtualized special
QPs.

However, this change also required replacing rdma_destroy_ah with
mlx4_ib_destroy_ah in the affected flows.

The commit missed 3 places where rdma_destroy_ah should have been replaced
with mlx4_ib_destroy_ah.

As a result, the pd usecount was decremented when the ah was destroyed --
although the usecount was NOT incremented when the ah was created.

This caused the pd usecount to become negative, and resulted in the
WARN_ON stack trace below when the mlx4_ib.ko module was unloaded:

WARNING: CPU: 3 PID: 25303 at drivers/infiniband/core/verbs.c:329 ib_dealloc_pd+0x6d/0x80 [ib_core]
Modules linked in: rdma_ucm rdma_cm iw_cm ib_cm ib_umad mlx4_ib(-) ib_uverbs ib_core mlx4_en mlx4_core nfsv3 nfs fscache configfs xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c ipt_REJECT nf_reject_ipv4 tun ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bridge stp llc dm_mirror dm_region_hash dm_log dm_mod dax rndis_wlan rndis_host coretemp kvm_intel cdc_ether kvm usbnet iTCO_wdt iTCO_vendor_support cfg80211 irqbypass lpc_ich ipmi_si i2c_i801 mii pcspkr i2c_core mfd_core ipmi_devintf i7core_edac ipmi_msghandler ioatdma pcc_cpufreq dca acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables ext4 mbcache jbd2 sr_mod cdrom ata_generic pata_acpi mptsas scsi_transport_sas mptscsih crc32c_intel ata_piix bnx2 mptbase ipv6 crc_ccitt autofs4 [last unloaded: mlx4_core]
CPU: 3 PID: 25303 Comm: modprobe Tainted: G        W I       5.0.0-rc1-net-mlx4+ #1
Hardware name: IBM  -[7148ZV6]-/Node 1, System Card, BIOS -[MLE170CUS-1.70]- 09/23/2011
RIP: 0010:ib_dealloc_pd+0x6d/0x80 [ib_core]
Code: 00 00 85 c0 75 02 5b c3 80 3d aa 87 03 00 00 75 f5 48 c7 c7 88 d7 8f a0 31 c0 c6 05 98 87 03 00 01 e8 07 4c 79 e0 0f 0b 5b c3 <0f> 0b eb be 0f 0b eb ab 90 66 2e 0f 1f 84 00 00 00 00 00 66 66 66
RSP: 0018:ffffc90005347e30 EFLAGS: 00010282
RAX: 00000000ffffffea RBX: ffff8888589e9540 RCX: 0000000000000006
RDX: 0000000000000006 RSI: ffff88885d57ad40 RDI: 0000000000000000
RBP: ffff88885b029c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000004 R12: ffff8887f06c0000
R13: ffff8887f06c13e8 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fd6743c6740(0000) GS:ffff88887fcc0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000ed1038 CR3: 00000007e3156000 CR4: 00000000000006e0
Call Trace:
 mlx4_ib_close_sriov+0x125/0x180 [mlx4_ib]
 mlx4_ib_remove+0x57/0x1f0 [mlx4_ib]
 mlx4_remove_device+0x92/0xa0 [mlx4_core]
 mlx4_unregister_interface+0x39/0x90 [mlx4_core]
 mlx4_ib_cleanup+0xc/0xd7 [mlx4_ib]
 __x64_sys_delete_module+0x17d/0x290
 ? trace_hardirqs_off_thunk+0x1a/0x1c
 ? do_syscall_64+0x12/0x180
 do_syscall_64+0x4a/0x180
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Fixes: 5e62d5ff ("IB/mlx4: Create slave AH's directly")
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>