Corrected an apparently long-standing error with the triggered rules

(such as widespacing or directional surround) that will cause the
rule to be triggered without a cause due to a failure to reset the
error count from a previous triggered rule (the condition of failure
is much more rare than this explanation makes it sound, which is why
it went undiscovered for so long).

drc/DRCbasic.c

@@ -623,6 +623,7 @@ drcTile (tile, arg)
 
 		result = 0;
 		arg->dCD_radial = 0; 
+		arg->dCD_entries = 0;
 		do {
 		    if (triggered)
 		    {
@@ -992,6 +993,7 @@ checkbottom:
 
 		result = 0;
 		arg->dCD_radial = 0; 
+		arg->dCD_entries = 0;
 		do {
 		    if (triggered)
 		    {