msm: ipa: Fix array out of bound and use after NULL check

Couple of code cleanup
 - Check for upper boundary for resource_index
   not to dependent on ipa_rm_dep_get_index function.
 - Check actual argument for NULL and return.

Change-Id: I0ab244e68d96f7841ab2a10e61f2546314166165
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>