media: usb: em28xx: Replace mdelay() with msleep() in em28xx_pre_card_setup()

em28xx_pre_card_setup() is never called in atomic context.
It calls mdelay() to busily wait, which is not necessary.
mdelay() can be replaced with msleep().

This is found by a static analysis tool named DCNS written by myself.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/usb/em28xx/em28xx-cards.c

@@ -2852,13 +2852,13 @@ static void em28xx_pre_card_setup(struct em28xx *dev)
 		em28xx_write_reg(dev, EM2880_R04_GPO, 0x01);
 		usleep_range(10000, 11000);
 		em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xfd);
-		mdelay(70);
+		msleep(70);
 		em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xfc);
-		mdelay(70);
+		msleep(70);
 		em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xdc);
-		mdelay(70);
+		msleep(70);
 		em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xfc);
-		mdelay(70);
+		msleep(70);
 		break;
 	case EM2870_BOARD_TERRATEC_XS_MT2060:
 		/*
@@ -2866,11 +2866,11 @@ static void em28xx_pre_card_setup(struct em28xx *dev)
 		 * demod work
 		 */
 		em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xfe);
-		mdelay(70);
+		msleep(70);
 		em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xde);
-		mdelay(70);
+		msleep(70);
 		em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xfe);
-		mdelay(70);
+		msleep(70);
 		break;
 	case EM2870_BOARD_PINNACLE_PCTV_DVB:
 		/*
@@ -2878,11 +2878,11 @@ static void em28xx_pre_card_setup(struct em28xx *dev)
 		 * DVB-T demod work
 		 */
 		em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xfe);
-		mdelay(70);
+		msleep(70);
 		em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xde);
-		mdelay(70);
+		msleep(70);
 		em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xfe);
-		mdelay(70);
+		msleep(70);
 		break;
 	case EM2820_BOARD_GADMEI_UTV310:
 	case EM2820_BOARD_MSI_VOX_USB_2: