omap3: spi: the symbol for Hertz is Hz

fix typo

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/drivers/spi/omap3_spi.c b/drivers/spi/omap3_spi.c
index ebbdcaf..1da4542 100644
--- a/drivers/spi/omap3_spi.c
+++ b/drivers/spi/omap3_spi.c
@@ -548,7 +548,8 @@
 	}
 
 	if (max_hz > OMAP3_MCSPI_MAX_FREQ) {
-		printf("SPI error: unsupported frequency %i Hz. Max frequency is 48 Mhz\n", max_hz);
+		printf("SPI error: unsupported frequency %i Hz. Max frequency is 48 MHz\n",
+		       max_hz);
 		return NULL;
 	}