UBI: make ubi_scan_erase_peb static and rename

The 'ubi_scan_erase_peb()' is used only in scan.c so can be static. Also
re-name it to 'early_erase_peb()' because we tend to use "ubi_" prefix only for
non-static fuction and also because the new name is better.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

drivers/mtd/ubi/scan.c

@@ -667,7 +667,7 @@ void ubi_scan_rm_volume(struct ubi_attach_info *ai, struct ubi_ainf_volume *av)
 }
 
 /**
- * ubi_scan_erase_peb - erase a physical eraseblock.
+ * early_erase_peb - erase a physical eraseblock.
  * @ubi: UBI device description object
  * @ai: attaching information
  * @pnum: physical eraseblock number to erase;
@@ -679,8 +679,8 @@ void ubi_scan_rm_volume(struct ubi_attach_info *ai, struct ubi_ainf_volume *av)
  * This function returns zero in case of success and a negative error code in
  * case of failure.
  */
-int ubi_scan_erase_peb(struct ubi_device *ubi, const struct ubi_attach_info *ai,
-		       int pnum, int ec)
+static int early_erase_peb(struct ubi_device *ubi,
+			   const struct ubi_attach_info *ai, int pnum, int ec)
 {
 	int err;
 	struct ubi_ec_hdr *ec_hdr;
@@ -748,7 +748,7 @@ struct ubi_ainf_peb *ubi_scan_get_free_peb(struct ubi_device *ubi,
 		if (aeb->ec == UBI_SCAN_UNKNOWN_EC)
 			aeb->ec = ai->mean_ec;
 
-		err = ubi_scan_erase_peb(ubi, ai, aeb->pnum, aeb->ec+1);
+		err = early_erase_peb(ubi, ai, aeb->pnum, aeb->ec+1);
 		if (err)
 			continue;
 

drivers/mtd/ubi/scan.h

@@ -167,8 +167,6 @@ struct ubi_ainf_peb *ubi_scan_find_aeb(const struct ubi_ainf_volume *av,
 void ubi_scan_rm_volume(struct ubi_attach_info *ai, struct ubi_ainf_volume *av);
 struct ubi_ainf_peb *ubi_scan_get_free_peb(struct ubi_device *ubi,
 					   struct ubi_attach_info *ai);
-int ubi_scan_erase_peb(struct ubi_device *ubi, const struct ubi_attach_info *ai,
-		       int pnum, int ec);
 struct ubi_attach_info *ubi_scan(struct ubi_device *ubi);
 void ubi_scan_destroy_ai(struct ubi_attach_info *ai);