graphics/grClip.c Branch condition evaluates to a garbage value

This is technically a false positive as grClipPoints() will always
initializes a value to ok1 and ok2 when called.  The function is in
the same compile unit, so probably the compiler can see this as well
and potentially not perform the initiailization begin performed in
this commit.

But to quieten and remove this item from the analysis report
assigning an initialization value.

SonarCloud
graphics/grClip.c:451 Branch condition evaluates to a garbage value
https://sonarcloud.io/project/issues?open=AZJB160MNGfDNup0Rit4&id=dlmiles_magic

graphics/grClip.c

@@ -434,7 +434,7 @@ GrClipLine(x1, y1, x2, y2)
 	    {
 		Point p1, p2;
 		Rect c;
-		bool ok1, ok2;
+		bool ok1 = FALSE, ok2 = FALSE;
 		c = ob->r_r;
 		c.r_xbot--;  c.r_ybot--;
 		c.r_xtop++;  c.r_ytop++;