[PATCH 2/2] ubinfo: fix `--all' for non-consecutive device numbers

[Brian Norris <computersforpeace@gmail.com>]

When we have assigned non-consecutive device numbers to our UBI devices,
then we run `ubinfo --all', we get errors once ubinfo tries to process the
devices in the "hole". For instance, suppose there are two UBI devices,
/dev/ubi0 and /dev/ubi10; then, ubinfo will fail trying to open /dev/ubi1
with:

  ubinfo: error!: cannot get information about UBI device 1
         error 2 (No such file or directory)

This patch adds a check to first see if device is present, then continue
to the next ID if it doesn't exist.

Reported-by: Brian Foster <brian.foster@maxim-ic.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
 ubi-utils/ubinfo.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/ubi-utils/ubinfo.c b/ubi-utils/ubinfo.c
index 7aa4aa4..cb88f53 100644
--- a/ubi-utils/ubinfo.c
+++ b/ubi-utils/ubinfo.c
@@ -362,6 +362,8 @@ static int print_general_info(libubi_t libubi, int all)
 
 	for (i = ubi_info.lowest_dev_num;
 	     i <= ubi_info.highest_dev_num; i++) {
+		if (!ubi_dev_present(libubi, i))
+			continue;
 		if(!first)
 			printf("\n===================================\n\n");
 		first = 0;
-- 
1.7.5.4