Fix nan problem in previous bevel commit.

For chains, access to g_prod[0] was undefined.
And two minor style (whitespace) changes.

source/blender/bmesh/tools/bmesh_bevel.c

@@ -1985,6 +1985,7 @@ static bool adjust_the_cycle_or_chain_fast(BoundVert *vstart, int np, bool iscyc
 		g_prod[i] = gprod;
 		gprod_sum += gprod;
 	}
+	g_prod[0] = 1.0f;
 	if (iscycle) {
 		gprod *= g[0];
 		if (fabs(gprod - 1.0f) > BEVEL_EPSILON) {
@@ -1993,8 +1994,6 @@ static bool adjust_the_cycle_or_chain_fast(BoundVert *vstart, int np, bool iscyc
 			MEM_freeN(g_prod);
 			return false;
 		}
-		else
-			g_prod[0] = 1.0f;
 	}
 	if (gprod_sum == 0.0f) {
 		MEM_freeN(g);