use else instead of else-if -- fixes 'possibly unused' warning

src/pathops/SkDQuadIntersection.cpp

 // Another approach is to start with the implicit form of one curve and solve
 // (seek implicit coefficients in QuadraticParameter.cpp
 // by substituting in the parametric form of the other.
 // The downside of this approach is that early rejects are difficult to come by.
 // http://planetmath.org/encyclopedia/GaloisTheoreticDerivationOfTheQuarticFormula.html#step
 
 
 #include "SkDQuadImplicit.h"
 #include "SkIntersections.h"
 #include "SkPathOpsLine.h"
@@ skipping 157 matching lines @@
             tsFound.push_back(rootTs[0][idx2]);
         }
     }
     int tCount = tsFound.count();
     if (tCount <= 0) {
         return true;
     }
     double tMin, tMax;
     if (tCount == 1) {
         tMin = tMax = tsFound[0];
-    } else if (tCount > 1) {
+    } else {
+        SkASSERT(tCount > 1);
         SkTQSort<double>(tsFound.begin(), tsFound.end() - 1);
         tMin = tsFound[0];
         tMax = tsFound[tsFound.count() - 1];
     }
     SkDPoint end = q2.xyAtT(t2s);
     bool startInTriangle = hull.pointInHull(end);
     if (startInTriangle) {
         tMin = t2s;
     }
     end = q2.xyAtT(t2e);
@@ skipping 309 matching lines @@
         }
         if (lowestIndex < 0) {
             break;
         }
         insert(roots1Copy[lowestIndex], roots2Copy[closest[lowestIndex]],
                 pts1[lowestIndex]);
         closest[lowestIndex] = -1;
     } while (++used < r1Count);
     return fUsed;
 }