egl: Cleanup control flow in _eglParseSyncAttribList
egl: Cleanup control flow in _eglParseSyncAttribList

When the function encountered an error, it effectively returned
immediately. However, it did so indirectly by breaking out of a loop.
Replace the loop breakout with a explicit 'return'.

Do the same for _eglParseSyncAttribList64 too.

Reviewed-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler