Use strict matching for --section command line option

Don't limit to string length of passed in section, otherwise we could
be matching more than one section.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/init.c b/init.c
index 6fdd211..4ae3baf 100644
--- a/init.c
+++ b/init.c
@@ -608,7 +608,7 @@
 	if (!strncmp(name, "global", 6))
 		return 0;
 
-	return strncmp(job_section, name, strlen(job_section));
+	return strcmp(job_section, name);
 }
 
 static int is_empty_or_comment(char *line)