[SeaBIOS] hw/usb-msc.c: Branch condition evaluates to a garbage value

[Paul Menzel]

Dear SeaBIOS developers,


Building the attached configuration with GCC 5.3.0 and the static 
analyzer scan-build shipped with Clang 3.8, the following error is 
reported in `src/hw/usb-msc.c` in line 110.

The static analyzer seems to think that the struct member is not 
initialized. But I guess it’s done in the line below, and therefore a 
false positive?

```
ret = usb_msc_send(udrive_gf, USB_DIR_IN
                        , MAKE_FLATPTR(GET_SEG(SS), &csw), sizeof(csw));
```


Thanks,

Paul
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#
# Automatically generated file; DO NOT EDIT.
# SeaBIOS Configuration
#

#
# General Features
#
CONFIG_COREBOOT=y
# CONFIG_QEMU is not set
# CONFIG_CSM is not set
# CONFIG_QEMU_HARDWARE is not set
CONFIG_THREADS=y
CONFIG_RELOCATE_INIT=y
CONFIG_BOOTMENU=y
CONFIG_BOOTSPLASH=y
CONFIG_BOOTORDER=y
CONFIG_COREBOOT_FLASH=y
CONFIG_LZMA=y
CONFIG_CBFS_LOCATION=0
CONFIG_MULTIBOOT=y
CONFIG_ENTRY_EXTRASTACK=y
CONFIG_MALLOC_UPPERMEMORY=y
CONFIG_ROM_SIZE=0

#
# Hardware support
#
CONFIG_ATA=y
# CONFIG_ATA_DMA is not set
# CONFIG_ATA_PIO32 is not set
CONFIG_AHCI=y
CONFIG_SDCARD=y
CONFIG_MEGASAS=y
CONFIG_FLOPPY=y
CONFIG_FLASH_FLOPPY=y
CONFIG_PS2PORT=y
CONFIG_USB=y
CONFIG_USB_UHCI=y
CONFIG_USB_OHCI=y
CONFIG_USB_EHCI=y
CONFIG_USB_XHCI=y
CONFIG_USB_MSC=y
CONFIG_USB_UAS=y
CONFIG_USB_HUB=y
CONFIG_USB_KEYBOARD=y
CONFIG_USB_MOUSE=y
CONFIG_SERIAL=y
CONFIG_LPT=y
CONFIG_RTC_TIMER=y
CONFIG_HARDWARE_IRQ=y
CONFIG_PMTIMER=y
CONFIG_TSC_TIMER=y

#
# BIOS interfaces
#
CONFIG_DRIVES=y
CONFIG_CDROM_BOOT=y
CONFIG_CDROM_EMU=y
CONFIG_PCIBIOS=y
CONFIG_APMBIOS=y
CONFIG_PNPBIOS=y
CONFIG_OPTIONROMS=y
CONFIG_PMM=y
CONFIG_BOOT=y
CONFIG_KEYBOARD=y
CONFIG_KBD_CALL_INT15_4F=y
CONFIG_MOUSE=y
CONFIG_S3_RESUME=y
CONFIG_VGAHOOKS=y
# CONFIG_DISABLE_A20 is not set
CONFIG_TCGBIOS=y

#
# VGA ROM
#
CONFIG_NO_VGABIOS=y
# CONFIG_VGA_GEODEGX2 is not set
# CONFIG_VGA_GEODELX is not set
# CONFIG_VGA_COREBOOT is not set
# CONFIG_BUILD_VGABIOS is not set
CONFIG_VGA_EXTRA_STACK_SIZE=512

#
# Debugging
#
CONFIG_DEBUG_LEVEL=8
# CONFIG_DEBUG_SERIAL is not set
CONFIG_DEBUG_COREBOOT=y