[Toybox] [PATCH] Fix -Wformat compiler warning in expr.c.

[enh]

Android forces -Wformat on for all source.

  toys/pending/expr.c:116:28: warning: field precision should have type 'int',
                                       but argument has type 'long' [-Wformat]
      ret->s = xmprintf("%.*s", m[1].rm_eo-m[1].rm_so, target+m[1].rm_so);
                         ~~^~   ~~~~~~~~~~~~~~~~~~~~~
---
 toys/pending/expr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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