mtd: afs: refactor v1 partition parsing

Return immediately if we are not finding a valid v1 partition
in afs_read_footer_v1(), invert scanning logic so we continue
to read image information on v1 if we found a footer. This is
needed for the logic we introduce to parse v2 footers.

Cc: Ryan Harkin <[e-mail]>
Cc: Liviu Dudau <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Signed-off-by: Brian Norris <[e-mail]>

drivers/mtd/afs.c

···
 		return ret;
 	}
 
-	ret = 1;
-
 	/*
 	 * Does it contain the magic number?
 	 */
 	if (fs.signature != AFSV1_FOOTER_MAGIC)
-		ret = 0;
+		return 0;
 
 	/*
 	 * Check the checksum.
 	 */
 	if (word_sum(&fs, sizeof(fs) / sizeof(u32)) != 0xffffffff)
-		ret = 0;
+		return 0;
 
 	/*
 	 * Don't touch the SIB.
 	 */
 	if (fs.type == 2)
-		ret = 0;
+		return 0;
 
 	*iis_start = fs.image_info_base & mask;
 	*img_start = fs.image_start & mask;
···
 	 * be located after the footer structure.
 	 */
 	if (*iis_start >= ptr)
-		ret = 0;
+		return 0;
 
 	/*
 	 * Check the start of this image.  The image
 	 * data can not be located after this block.
 	 */
 	if (*img_start > off)
-		ret = 0;
+		return 0;
 
-	return ret;
+	return 1;
 }
 
 static int
···
 		ret = afs_read_footer_v1(mtd, &img_ptr, &iis_ptr, off, mask);
 		if (ret < 0)
 			break;
-		if (ret == 0)
-			continue;
+		if (ret) {
+			ret = afs_read_iis_v1(mtd, &iis, iis_ptr);
+			if (ret < 0)
+				break;
+			if (ret == 0)
+				continue;
 
-		ret = afs_read_iis_v1(mtd, &iis, iis_ptr);
-		if (ret < 0)
-			break;
-		if (ret == 0)
-			continue;
-
-		sz += sizeof(struct mtd_partition);
-		sz += strlen(iis.name) + 1;
-		idx += 1;
+			sz += sizeof(struct mtd_partition);
+			sz += strlen(iis.name) + 1;
+			idx += 1;
+		}
 	}
 
 	if (!sz)