mtd: Fix typo: "occured" -> "occurred"

Trivial typo fix in comment.
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.kw@hitachi.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/mtdchar.c

@@ -451,7 +451,7 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
 	 * data. For our userspace tools it is important to dump areas
 	 * with ECC errors!
 	 * For kernel internal usage it also might return -EUCLEAN
-	 * to signal the caller that a bitflip has occured and has
+	 * to signal the caller that a bitflip has occurred and has
 	 * been corrected by the ECC algorithm.
 	 *
 	 * Note: currently the standard NAND function, nand_read_oob_std,

drivers/mtd/spi-nor/spi-nor.c

@@ -122,7 +122,7 @@ static int read_fsr(struct spi_nor *nor)
 /*
  * Read configuration register, returning its value in the
  * location. Return the configuration register value.
- * Returns negative if error occured.
+ * Returns negative if error occurred.
  */
 static int read_cr(struct spi_nor *nor)
 {
@@ -1236,7 +1236,7 @@ static int macronix_quad_enable(struct spi_nor *nor)
  * Write status Register and configuration register with 2 bytes
  * The first byte will be written to the status register, while the
  * second byte will be written to the configuration register.
- * Return negative if error occured.
+ * Return negative if error occurred.
  */
 static int write_sr_cr(struct spi_nor *nor, u16 val)
 {