staging: mt7621-mmc: Add blank line after declaration

Correct the following warning from checkpatch.pl:

WARNING: Missing a blank line after declarations
+		struct msdc_host *host = mmc_priv(mmc);
+		msdc_pm(state, (void *)host);
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@protonmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/sd.c

@@ -1797,6 +1797,7 @@ static void msdc_drv_pm(struct platform_device *pdev, pm_message_t state)
 
 	if (mmc) {
 		struct msdc_host *host = mmc_priv(mmc);
+
 		msdc_pm(state, (void *)host);
 	}
 }