Add a check to error out in the following case:

 # ./btrfs qgroup limit  T /mnt/
Invalid size argument given

Without this patch, btrfs-progs would parse the input as 0
and continue.

Signed-off-by: Dongsheng Yang <[email protected]>
---
 cmds-qgroup.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cmds-qgroup.c b/cmds-qgroup.c
index 5ea4021..9545a20 100644
--- a/cmds-qgroup.c
+++ b/cmds-qgroup.c
@@ -121,6 +121,9 @@ static int parse_limit(const char *p, unsigned long long *s)
                return 0;
 
        size = strtoull(p, &endptr, 10);
+       if (p == endptr)
+               return 0;
+
        switch (*endptr) {
        case 'T':
        case 't':
-- 
1.8.4.2

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