ACPI: tools: pfrut: Do not initialize ret in main()

The initialization is unnecessary, because ret is always assigned a new
value before reading it.
Signed-off-by: Shi junming <junming@nfschina.com>
[ rjw: Subject edits, new changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

tools/power/acpi/tools/pfrut/pfrut.c

@@ -190,7 +190,7 @@ int main(int argc, char *argv[])
 	void *addr_map_capsule;
 	struct stat st;
 	char *log_buf;
-	int ret = 0;
+	int ret;
 
 	if (getuid() != 0) {
 		printf("Please run the tool as root - Exiting.\n");