egl: move Null check to eglGetSyncAttribKHR to prevent Segfault

Null-check on "*value" is currently done in _eglGetSyncAttrib, which is
after eglGetSyncAttribKHR dereferences it.

Move the check a layer up (in the beginning of eglGetSyncAttribKHR) to
avoid segfaults.

Cc: "11.0 11.1" <[email protected]
Signed-off-by: Dongwon Kim <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
[Emil Velikov: tweak commit message, add stable tag]
Reviewed-by: Emil Velikov <[email protected]>

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