Fix logic to follow comment.

Author: Opt-Mucca

highs/mip/HighsPrimalHeuristics.cpp

@@ -444,7 +444,7 @@ void HighsPrimalHeuristics::RENS(const std::vector<double>& tmp) {
           fixval = std::ceil(fracval);
         else if (rootchange <= -0.4)
           fixval = std::floor(fracval);
-        if (mipsolver.model_->col_cost_[col] > 0.0)
+        else if (mipsolver.model_->col_cost_[col] > 0.0)
           fixval = std::ceil(fracval);
         else if (mipsolver.model_->col_cost_[col] < 0.0)
           fixval = std::floor(fracval);
@@ -673,7 +673,7 @@ void HighsPrimalHeuristics::RINS(const std::vector<double>& relaxationsol) {
           fixval = std::ceil(fracval);
         else if (rootchange <= -0.4)
           fixval = std::floor(fracval);
-        if (mipsolver.model_->col_cost_[col] > 0.0)
+        else if (mipsolver.model_->col_cost_[col] > 0.0)
           fixval = std::ceil(fracval);
         else if (mipsolver.model_->col_cost_[col] < 0.0)
           fixval = std::floor(fracval);