Refactor image_saver_tinyexr.cpp to prevent compiler warnings.
Refactor image_saver_tinyexr.cpp to prevent compiler warnings.

Prevents GCC compiler throwing: control reaches end of non-void function.
Prevents Visual Studio throwing C4715: not all control paths return a value.

Faless/godot,BastiaanOlij/godot,akien-mga/godot,guilhermefelipecgs/godot,Valentactive/godot,Faless/godot,DmitriySalnikov/godot,sanikoyes/godot,vnen/godot,vnen/godot,MarianoGnu/godot,Valentactive/godot,godotengine/godot,BastiaanOlij/godot,josempans/godot,ZuBsPaCe/godot,Shockblast/godot,firefly2442/godot,honix/godot,Paulloz/godot,Valentactive/godot,firefly2442/godot,josempans/godot,vkbsb/godot,akien-mga/godot,honix/godot,ZuBsPaCe/godot,akien-mga/godot,akien-mga/godot,Valentactive/godot,Zylann/godot,pkowal1982/godot,vkbsb/godot,Paulloz/godot,guilhermefelipecgs/godot,vkbsb/godot,honix/godot,DmitriySalnikov/godot,firefly2442/godot,Paulloz/godot,sanikoyes/godot,Paulloz/godot,honix/godot,MarianoGnu/godot,ZuBsPaCe/godot,Shockblast/godot,DmitriySalnikov/godot,josempans/godot,Faless/godot,vnen/godot,guilhermefelipecgs/godot,firefly2442/godot,vkbsb/godot,josempans/godot,guilhermefelipecgs/godot,vnen/godot,godotengine/godot,ZuBsPaCe/godot,vnen/godot,vkbsb/godot,pkowal1982/godot,BastiaanOlij/godot,DmitriySalnikov/godot,pkowal1982/godot,josempans/godot,Shockblast/godot,ZuBsPaCe/godot,josempans/godot,Paulloz/godot,MarianoGnu/godot,vkbsb/godot,godotengine/godot,DmitriySalnikov/godot,Valentactive/godot,sanikoyes/godot,ZuBsPaCe/godot,ZuBsPaCe/godot,vkbsb/godot,Zylann/godot,akien-mga/godot,Faless/godot,pkowal1982/godot,Shockblast/godot,Zylann/godot,sanikoyes/godot,godotengine/godot,firefly2442/godot,BastiaanOlij/godot,BastiaanOlij/godot,Shockblast/godot,pkowal1982/godot,Valentactive/godot,pkowal1982/godot,DmitriySalnikov/godot,Zylann/godot,Zylann/godot,Shockblast/godot,akien-mga/godot,Faless/godot,honix/godot,BastiaanOlij/godot,Paulloz/godot,Valentactive/godot,Shockblast/godot,godotengine/godot,sanikoyes/godot,akien-mga/godot,Faless/godot,ZuBsPaCe/godot,guilhermefelipecgs/godot,Valentactive/godot,sanikoyes/godot,MarianoGnu/godot,vnen/godot,josempans/godot,godotengine/godot,Shockblast/godot,MarianoGnu/godot,guilhermefelipecgs/godot,sanikoyes/godot,pkowal1982/godot,Zylann/godot,godotengine/godot,Zylann/godot,DmitriySalnikov/godot,BastiaanOlij/godot,Zylann/godot,vkbsb/godot,vnen/godot,josempans/godot,firefly2442/godot,MarianoGnu/godot,sanikoyes/godot,honix/godot,godotengine/godot,pkowal1982/godot,Faless/godot,akien-mga/godot,firefly2442/godot,Faless/godot,BastiaanOlij/godot,firefly2442/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,MarianoGnu/godot,MarianoGnu/godot,vnen/godot,Paulloz/godot