checkpatch: Recognize IEC binary prefix definitions

Do not match the IEC binary prefix as camelcase typedefs.

This fixes:

    ERROR: "foo * bar" should be "foo *bar"
    #310: FILE: hw/ppc/ppc440_uc.c:564:
    +        size = 8 * MiB * sh;
    total: 1 errors, 0 warnings, 433 lines checked

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20180625124238.25339-5-f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

scripts/checkpatch.pl

@@ -242,6 +242,7 @@ our $UTF8	= qr{
 # There are still some false positives, but this catches most
 # common cases.
 our $typeTypedefs = qr{(?x:
+        (?![KMGTPE]iB)                      # IEC binary prefix (do not match)
         [A-Z][A-Z\d_]*[a-z][A-Za-z\d_]*     # camelcase
         | [A-Z][A-Z\d_]*AIOCB               # all uppercase
         | [A-Z][A-Z\d_]*CPU                 # all uppercase