MIPS: KVM: Do not sign extend on unsigned MMIO load

Fix possible unintended sign extension in unsigned MMIO loads by casting
to uint16_t in the case of mmio_needed != 2.

Signed-off-by: Nicholas Mc Guire <[e-mail]>
Reviewed-by: James Hogan <[e-mail]>
Tested-by: James Hogan <[e-mail]>
Cc: Gleb Natapov <[e-mail]>
Cc: Paolo Bonzini <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/9985/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/kvm/emulate.c

···
 		if (vcpu->mmio_needed == 2)
 			*gpr = *(int16_t *) run->mmio.data;
 		else
-			*gpr = *(int16_t *) run->mmio.data;
+			*gpr = *(uint16_t *)run->mmio.data;
 
 		break;
 	case 1: