mexMatvec: dimension of 4TH input is incorrect

For `MOI.Test.linear9test` and `MOI.Test.lin4test`, I get the error:
```
julia> MOIT.lin4test(BRIDGED, CONFIG)
Error using mexMatvec
mexMatvec: dimension of 4TH input is incorrect

Error in matvecSSN

Error in psqmrAB

Error in SSNfun

Error in sdpnalplus_main_default

Error in sdpnalplus

>>
Intel MKL ERROR: Parameter 6 was incorrect on entry to DGEMV .
Error using save
Variable 'jx_sdpnalplus_arg_out_1' not found.

ERROR: MATLAB.MEngineError("failed to get variable jx_sdpnalplus_arg_out_1 from MATLAB session")
Stacktrace:
[1] get_mvariable(::MATLAB.MSession, ::Symbol) at /home/blegat/.julia/packages/MATLAB/cVrxc/src/engine.jl:164
[2] mxcall(::MATLAB.MSession, ::Symbol, ::Int64, ::Array{Any,2}, ::Vararg{Any,N} where N) at /home/blegat/.julia/packages/MATLAB/cVrxc/src/engine.jl:297
[3] mxcall at /home/blegat/.julia/packages/MATLAB/cVrxc/src/engine.jl:317 [inlined]
...
```