When using -D do not try to check the gmt_raster_type(). (#7741)

Fixes #7570

Co-authored-by: Paul Wessel <pwessel@hawaii.edu>

src/grdcut.c

@@ -294,20 +294,22 @@ static int parse (struct GMT_CTRL *GMT, struct GRDCUT_CTRL *Ctrl, struct GMT_OPT
 	n_errors += gmt_M_check_condition (GMT, !Ctrl->G.file && !Ctrl->D.active, "Option -G: Must specify output grid file\n");
 	n_errors += gmt_M_check_condition (GMT, !Ctrl->In.active, "Must specify one input grid file\n");
 	if (n_errors == 0) {
-		int ftype = gmt_raster_type (GMT, Ctrl->In.file, true);
-		if (ftype == GMT_IS_IMAGE)	/* Must read file as an image */
-			Ctrl->In.type = GMT_IS_IMAGE;
-		else if (ftype == GMT_IS_GRID) {	/* Check extension in case of special case */
-			if (strstr (Ctrl->G.file, ".tif"))	/* Want to write a single band (normally written as a grid) to geotiff instead */
+		if (!Ctrl->D.quit) {
+			int ftype = gmt_raster_type(GMT, Ctrl->In.file, true);
+			if (ftype == GMT_IS_IMAGE)	/* Must read file as an image */
 				Ctrl->In.type = GMT_IS_IMAGE;
-			else
+			else if (ftype == GMT_IS_GRID) {	/* Check extension in case of special case */
+				if (strstr (Ctrl->G.file, ".tif"))	/* Want to write a single band (normally written as a grid) to geotiff instead */
+					Ctrl->In.type = GMT_IS_IMAGE;
+				else
+					Ctrl->In.type = GMT_IS_GRID;
+			}
+			else	/* Just have to assume it is a grid */
 				Ctrl->In.type = GMT_IS_GRID;
-		}
-		else	/* Just have to assume it is a grid */
-			Ctrl->In.type = GMT_IS_GRID;
-		if (Ctrl->In.type == GMT_IS_IMAGE) {
-			n_errors += gmt_M_check_condition (GMT, Ctrl->Z.active, "Option -N: Cannot be used with an image\n");
-			n_errors += gmt_M_check_condition (GMT, Ctrl->Z.active, "Option -Z: Cannot be used with an image\n");
+			if (Ctrl->In.type == GMT_IS_IMAGE) {
+				n_errors += gmt_M_check_condition (GMT, Ctrl->Z.active, "Option -N: Cannot be used with an image\n");
+				n_errors += gmt_M_check_condition (GMT, Ctrl->Z.active, "Option -Z: Cannot be used with an image\n");
+			}
 		}
 	}