blackfin: don't use 'bool' when it causes problems

The use of 'bool' data types in globally used header files cases build
errors like this:

In file included from arch/blackfin/include/asm/blackfin.h:13:0,
                 from include/common.h:92,
                 from cmd_test.c:17:
arch/blackfin/include/asm/blackfin_local.h:54:1: error: unknown type name 'bool'

Use plain 'int' instead to avoid such kind of trouble.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/arch/blackfin/include/asm/blackfin_local.h b/arch/blackfin/include/asm/blackfin_local.h
index ab31dcb..8ea8cde 100644
--- a/arch/blackfin/include/asm/blackfin_local.h
+++ b/arch/blackfin/include/asm/blackfin_local.h
@@ -51,7 +51,7 @@
 
 # define bfin_revid() (bfin_read_CHIPID() >> 28)
 
-extern bool bfin_os_log_check(void);
+extern int bfin_os_log_check(void);
 extern void bfin_os_log_dump(void);
 
 extern void blackfin_icache_flush_range(const void *, const void *);