staging: mt7621-spi: Remove unnecessary braces {} from single statement if block.

The patch fixes following checkpatch.pl issue:
WARNING : braces {} are not necessary for single statement blocks
Signed-off-by: Sankalp Negi <sankalpnegi2310@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-spi/spi-mt7621.c

@@ -166,9 +166,8 @@ static inline int mt7621_spi_wait_till_ready(struct mt7621_spi *rs)
 		u32 status;
 
 		status = mt7621_spi_read(rs, MT7621_SPI_TRANS);
-		if ((status & SPITRANS_BUSY) == 0) {
+		if ((status & SPITRANS_BUSY) == 0)
 			return 0;
-		}
 		cpu_relax();
 		udelay(1);
 	}