mtd: spi-nor: swp: Improve code around spi_nor_check_lock_status_sr()

- bool return value for spi_nor_check_lock_status_sr(), gets rid of
  the return 1,
- introduce temporary variables for better readability.
Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20210322075131.45093-3-tudor.ambarus@microchip.com

drivers/mtd/spi-nor/swp.c

@@ -81,36 +81,39 @@ static void spi_nor_get_locked_range_sr(struct spi_nor *nor, u8 sr, loff_t *ofs,
 }
 
 /*
- * Return 1 if the entire region is locked (if @locked is true) or unlocked (if
- * @locked is false); 0 otherwise
+ * Return true if the entire region is locked (if @locked is true) or unlocked
+ * (if @locked is false); false otherwise.
  */
-static int spi_nor_check_lock_status_sr(struct spi_nor *nor, loff_t ofs,
-					uint64_t len, u8 sr, bool locked)
+static bool spi_nor_check_lock_status_sr(struct spi_nor *nor, loff_t ofs,
+					 uint64_t len, u8 sr, bool locked)
 {
-	loff_t lock_offs;
+	loff_t lock_offs, lock_offs_max, offs_max;
 	uint64_t lock_len;
 
 	if (!len)
-		return 1;
+		return true;
 
 	spi_nor_get_locked_range_sr(nor, sr, &lock_offs, &lock_len);
 
+	lock_offs_max = lock_offs + lock_len;
+	offs_max = ofs + len;
+
 	if (locked)
 		/* Requested range is a sub-range of locked range */
-		return (ofs + len <= lock_offs + lock_len) && (ofs >= lock_offs);
+		return (offs_max <= lock_offs_max) && (ofs >= lock_offs);
 	else
 		/* Requested range does not overlap with locked range */
-		return (ofs >= lock_offs + lock_len) || (ofs + len <= lock_offs);
+		return (ofs >= lock_offs_max) || (offs_max <= lock_offs);
 }
 
-static int spi_nor_is_locked_sr(struct spi_nor *nor, loff_t ofs, uint64_t len,
-				u8 sr)
+static bool spi_nor_is_locked_sr(struct spi_nor *nor, loff_t ofs, uint64_t len,
+				 u8 sr)
 {
 	return spi_nor_check_lock_status_sr(nor, ofs, len, sr, true);
 }
 
-static int spi_nor_is_unlocked_sr(struct spi_nor *nor, loff_t ofs, uint64_t len,
-				  u8 sr)
+static bool spi_nor_is_unlocked_sr(struct spi_nor *nor, loff_t ofs,
+				   uint64_t len, u8 sr)
 {
 	return spi_nor_check_lock_status_sr(nor, ofs, len, sr, false);
 }