Coverity CIDs 138749, 138750: cnb20le_res() unintended sign extension

[Bjorn Helgaas <bhelgaas@google.com>]

Coverity complains about unintended sign extension in cnb20le_res() in
arch/x86/pci/broadcom_bus.c here:

60        word1 = read_pci_config_16(bus, slot, func, 0xc4);
 61        word2 = read_pci_config_16(bus, slot, func, 0xc6);
 62        if (word1 != word2) {

CID 138749 (#1 of 2): Unintended sign extension (SIGN_EXTENSION)
sign_extension: Suspicious implicit sign extension: word1 with type
unsigned short (16 bits, unsigned) is promoted in (word1 << 16) | 0 to
type int (32 bits, signed), then sign-extended to type unsigned long
long (64 bits, unsigned). If (word1 << 16) | 0 is greater than
0x7FFFFFFF, the upper bits of the result will all be 1.
 63                res.start = (word1 << 16) | 0x0000;
    CID 138750: Unintended sign extension (SIGN_EXTENSION) [select issue]
 64                res.end   = (word2 << 16) | 0xffff;
 65                res.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
 66                update_res(info, res.start, res.end, res.flags, 0);
 67        }

Bjorn