hw/omap_intc.c: Avoid crash on access to nonexistent banked registers
Avoid a crash due to null pointer dereference if a guest attempts to access banked registers for a nonexistent bank. Spotted by Coverity (see bug 887883). Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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