mmc: block: check for NULL pointer before dereferencing

mmc block data can be NULL. Hence, check for NULL before
dereferencing md.

CRs-Fixed: 562259
Change-Id: I0182c216ec73347cdd2ea464f593839fffd242a9
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
msm: msm_bus: Don't divide RPM BW requests

When sending bandwidth requests to slave don't divide the request by
the number of ports as this is done at the RPM driver.

CRs-Fixed: 611965
Change-Id: Ie6870b66d1621677d94e4441136aed89bbdb6595
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>