fix(nvme_readwrite): add missing return

drivers/nvme/nvme.asm

@@ -496,7 +496,10 @@ proc nvme_readwrite stdcall, ns:dword, buf:dword, start_sector:qword, numsectors
 @@:
 	mov 	ebx, [numsectors_ptr]
 	mov 	dword [ebx], 0
+	add 	esp, 20
+	pop 	edi esi ebx
 	or 	eax, -1 ; generic disk error
+	ret
 
 endp