wlroots: backport patch for free() of ununitialized

This cherrypicks an upstream-but-unreleased commit for the following
build failure.  Strangely, this warning is not emittted on x86_64.

FAILED: libwlroots.so.11.p/render_egl.c.o
gcc -Ilibwlroots.so.11.p -I. -I.. -Iinclude -I../include -Iprotocol -I../protocol -Irender/gles2/shaders -Irender/vulkan/shade
../render/egl.c: In function 'egl_init_display':
../render/egl.c:179:17: error: 'external_only' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  179 |                 free(external_only);
      |                 ^~~~~~~~~~~~~~~~~~~
../render/egl.c:128:29: note: 'external_only' was declared here
  128 |                 EGLBoolean *external_only;
      |                             ^~~~~~~~~~~~~
../render/egl.c:178:17: error: 'modifiers' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  178 |                 free(modifiers);
      |                 ^~~~~~~~~~~~~~~
../render/egl.c:127:27: note: 'modifiers' was declared here
  127 |                 uint64_t *modifiers;
      |                           ^~~~~~~~~
cc1: all warnings being treated as errors

0 files changed, 0 insertions, 0 deletions