dtc: fix some more -Wshadow warnings

Building on a RHEL6 system produced the following -Wshadow warnings in
fstree.c, util.c and checks.c:

cc1: warnings being treated as errors
checks.c: In function 'parse_checks_option':
checks.c:709: error: declaration of 'optarg' shadows a global
declaration
/usr/include/getopt.h:59: error: shadowed declaration is here
make[1]: *** [checks.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: *** Waiting for unfinished jobs....
cc1: warnings being treated as errors
fstree.c: In function 'read_fstree':
fstree.c:40: error: declaration of 'tmpnam' shadows a global
declaration
/usr/include/stdio.h:208: error: shadowed declaration is here
make[1]: *** [fstree.o] Error 1
cc1: warnings being treated as errors
util.c: In function 'xstrdup':
util.c:42: error: declaration of 'dup' shadows a global declaration
/usr/include/unistd.h:528: error: shadowed declaration is here

Fix all of these -Wshadow warnings by using slightly different variable
names which won't collide with anything else.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/dtc.h b/dtc.h
index 20e4d56..20de073 100644
--- a/dtc.h
+++ b/dtc.h
@@ -247,7 +247,7 @@ void sort_tree(struct boot_info *bi);
 
 /* Checks */
 
-void parse_checks_option(bool warn, bool error, const char *optarg);
+void parse_checks_option(bool warn, bool error, const char *arg);
 void process_checks(bool force, struct boot_info *bi);
 
 /* Flattened trees */