mmc: msm_sdcc: Prevent NULL pointer dereference in IRQ

Ensure card object is accessed only when it is not NULL. Use
AND in place of OR operator, and correctly check for presence
of SDIO card.

Change-Id: Ibd95b4b213da3db5bdf83e3ca5664e88291e6e36
Signed-off-by: Oluwafemi Adeyemi <aadeyemi@codeaurora.org>