RDMA/bnxt_re: Fix to drop reference to the mmap entry in case of error

In the error handling path of bnxt_re_mmap(), driver should invoke
rdma_user_mmap_entry_put() to free the reference of mmap entry in case
the error happens after rdma_user_mmap_entry_get was called.

Fixes: ea22248 ("RDMA/bnxt_re: Update alloc_page uapi for pacing")
Reviewed-by: Saravanan Vajravel <saravanan.vajravel@broadcom.com>
Reviewed-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://patch.msgid.link/20250104061519.2540178-1-kalesh-anakkur.purayil@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

Author: Kalesh AP

drivers/infiniband/hw/bnxt_re/ib_verbs.c

@@ -4465,9 +4465,10 @@ int bnxt_re_mmap(struct ib_ucontext *ib_uctx, struct vm_area_struct *vma)
 	case BNXT_RE_MMAP_TOGGLE_PAGE:
 		/* Driver doesn't expect write access for user space */
 		if (vma->vm_flags & VM_WRITE)
-			return -EFAULT;
-		ret = vm_insert_page(vma, vma->vm_start,
-				     virt_to_page((void *)bnxt_entry->mem_offset));
+			ret = -EFAULT;
+		else
+			ret = vm_insert_page(vma, vma->vm_start,
+					     virt_to_page((void *)bnxt_entry->mem_offset));
 		break;
 	default:
 		ret = -EINVAL;