shader: zero out-of-range scalar descriptor reads

src/graphics/shader/recompiler/ir/passes/SrtWalker.cpp

@@ -695,7 +695,8 @@ bool SrtWalker::EvaluateRawRead(const Inst& inst, uint64_t& result) {
 		                      ? static_cast<uint64_t>(static_cast<uint32_t>(records))
 		                      : static_cast<uint64_t>(stride) * static_cast<uint32_t>(records);
 		if (byte_offset > size || size - byte_offset < sizeof(uint32_t)) {
-			return false;
+			result = 0u;
+			return true;
 		}
 		address = (base & ~uint64_t {3}) + byte_offset;
 	} else {