[Toybox] [PATCH] Fix the type of the callback in getprop.

[enh]

Fixes:

  toys/android/getprop.c:56:39: warning: incompatible pointer types
    passing 'void (void *, const char *, const char *)' to parameter of
    type 'void (*)(void *, const char *, const char *, uint32_t)'
    (aka 'void (*)(void *, const char *, const char *, unsigned int)')
    [-Wincompatible-pointer-types]

  __system_property_read_callback(pi, read_callback, NULL);
                                      ^~~~~~~~~~~~~
---
 toys/android/getprop.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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