msm: ipa: fix parameter check in delete resource

fix parameter check in ipa_rm_resource_delete() in order to
avoid dereferencing a NULL pointer.

Change-Id: Ia66b5a03ce0a43e4f0add25a9d41eb55371f3577
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Nadine Toledano <nadinet@codeaurora.org>