Remove an unneeded variable and fix a little whitespace.

Found using Clang's static analyzer.

Python/getcwd.c

@@ -59,14 +59,13 @@ getcwd(char *buf, int size)
 {
 	FILE *fp;
 	char *p;
-	int sts;
 	if (size <= 0) {
 		errno = EINVAL;
 		return NULL;
 	}
 	if ((fp = popen(PWD_CMD, "r")) == NULL)
 		return NULL;
-	if (fgets(buf, size, fp) == NULL || (sts = pclose(fp)) != 0) {
+	if (fgets(buf, size, fp) == NULL || pclose(fp) != 0) {
 		errno = EACCES; /* Most likely error */
 		return NULL;
 	}