msm: ipc: Add check to avoid integer & buffer overflow
In IPC Router service lookup operation, add check to avoid an integer
overflow and hence a buffer overflow.
CRs-Fixed: 457402
Change-Id: Ibe949fe20aad88b15679bdc96ebc505e4395ac3b
Signed-off-by:
Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
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