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Fix string leak in helper_get_value

correctmost requested to merge correctmost/xfce4-power-manager:cm/fix-stdout-leak into master

Leak report

128 bytes in 1 blocks are definitely lost in loss record 5,073 of 5,490
   at 0x484BE40: realloc (vg_replace_malloc.c:1800)
   by 0x59B3701: g_realloc (gmem.c:171)
   by 0x59CF857: g_string_expand (gstring.c:82)
   by 0x59CF8CB: g_string_sized_new (gstring.c:113)
   by 0x59CFE5B: g_string_new (gstring.c:134)
   by 0x5A02860: g_spawn_sync_impl (gspawn-posix.c:262)
   by 0x59CC36A: g_spawn_sync (gspawn.c:152)
   by 0x59CC797: g_spawn_command_line_sync (gspawn.c:589)
   by 0x12F6D6: helper_get_value (xfpm-brightness-polkit.c:86)
   by 0x12F84A: xfpm_brightness_polkit_setup (xfpm-brightness-polkit.c:117)
   by 0x12D6F3: xfpm_brightness_new (xfpm-brightness.c:96)
   by 0x123E0E: xfpm_backlight_init (xfpm-backlight.c:372)
[...snip...]

Testing

  • No issues were detected with Valgrind when testing the patch

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