[Toybox] expr warning fixes

[Frank Barchard]

There are 2 warnings in expr.c which occur during android builds:

external/toybox/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);
                         ~~^~   ~~~~~~~~~~~~~~~~~~~~~
external/toybox/toys/pending/expr.c:247:24: warning: missing field 'i'
initializer [-Wmissing-field-initializers]
  struct value ret = {0};
                       ^

I proposed a patch there, but they suggested doing the fix here first.

Filed issue here:
https://github.com/landley/toybox/issues/64

Attached is the git format-patch -1 patch
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