util/cbfstool: Remove unused assignment

This variable is overwritten on one branch of the next if statement, and
the other branch returns, so this assignment does nothing.

Change-Id: I63737929d47c882bbcf637182bc8bf73c19daa9f
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Found-by: scan-build 8.0.0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34644
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/cbfstool/ifittool.c

@@ -336,7 +336,6 @@ int main(int argc, char *argv[])
 	case ADD_REGI_OP:
 	{
 		struct buffer region;
-		addr = 0;
 
 		if (partitioned_file_read_region(&region, image_file, name)) {
 			addr = -convert_to_from_top_aligned(&region, 0);