komodod crash in mining code

[dimxy]

With mining on, komodod sometimes crashes (observed on a dedicated node, with no ASIC).
Here is the backtrace:

Core was generated by `./komodod -gen -genproclimit=1 -pubkey=...'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  BitcoinMiner (pwallet=<optimized out>) at miner.cpp:1624
1624                                    index_vector[i] = eq.sols[s][i];
[Current thread is 1 (Thread 0x7f442bfff700 (LWP 26388))]

It looks like that the index 's' ranging from 0 from eq.nsols may get over eq.sols upper bound equal to MAXSOLS.
To fix this, the suggestion is to have the range for 's' from 0 to min(MAXSOLS, eq.nsols)

[dimxy]

fixed in #559