[Toybox] [PATCH] mount.c: fix an error check.

[enh]

Found by GCC 9:

  toys/lsb/mount.c:188:22: warning: '%s' directive argument is null
[-Wformat-overflow=]
---
 toys/lsb/mount.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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