Typo fix in ximageproc BrightEdges

Author: asmorkalov

modules/ximgproc/src/brightedges.cpp

@@ -150,7 +150,7 @@ namespace cv
                 iedge.ptr(row + 1)[col + 2] +
                 iedge.ptr(row - 1)[col + 2];
             if (line < weight) lines += 1;
-            if (line == 1) return 0;
+            if (lines == 1) return 0;
             // Compute surrounding pixels for dark zone
             int surround = iedge.ptr(row - 1)[col - 1] +
                 iedge.ptr(row - 1)[col] +