meta: Drop unnecessary early returns in _mesa_meta_BlitFramebuffer.
meta: Drop unnecessary early returns in _mesa_meta_BlitFramebuffer.

These aren't necessary - all of the following code is predicated on mask
being non-zero, so no code will get executed anyway.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>
Reviewed-by: Courtney Goeltzenleuchter <de5e92d0aa220e70735ac740f87439cfa8f82eb2@lunarg.com>
Reviewed-by: Chris Forbes <5dcac483e7a6e31a5cbe89f38cc69dff8ee93dac@ijw.co.nz>
Cc: "10.2" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>

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