progs/fp: Redraw upon keypress.

(cherry picked from commit cde6643724)

progs/fp/fp-tri.c

@@ -197,7 +197,7 @@ static void Key(unsigned char key, int x, int y)
       case 27:
 	exit(1);
       default:
-	return;
+	break;
     }
 
     glutPostRedisplay();

progs/fp/point-position.c

@@ -55,7 +55,7 @@ static void Key(unsigned char key, int x, int y)
       case 27:
 	exit(1);
       default:
-	return;
+	break;
     }
 
     glutPostRedisplay();

progs/fp/tri-depth.c

@@ -57,7 +57,7 @@ static void Key(unsigned char key, int x, int y)
       case 27:
 	exit(1);
       default:
-	return;
+	break;
     }
 
     glutPostRedisplay();

progs/fp/tri-depth2.c

@@ -59,7 +59,7 @@ static void Key(unsigned char key, int x, int y)
       case 27:
 	exit(1);
       default:
-	return;
+	break;
     }
 
     glutPostRedisplay();

progs/fp/tri-depthwrite.c

@@ -55,7 +55,7 @@ static void Key(unsigned char key, int x, int y)
       case 27:
 	exit(1);
       default:
-	return;
+	break;
     }
 
     glutPostRedisplay();

progs/fp/tri-depthwrite2.c

@@ -55,7 +55,7 @@ static void Key(unsigned char key, int x, int y)
       case 27:
 	exit(1);
       default:
-	return;
+	break;
     }
 
     glutPostRedisplay();

progs/fp/tri-param.c

@@ -54,7 +54,7 @@ static void Key(unsigned char key, int x, int y)
       case 27:
 	exit(1);
       default:
-	return;
+	break;
     }
 
     glutPostRedisplay();

progs/fp/tri-tex.c

@@ -76,7 +76,7 @@ static void Key(unsigned char key, int x, int y)
       case 27:
 	exit(1);
       default:
-	return;
+	break;
     }
 
     glutPostRedisplay();