libsemanage: Fix snprintf warnings from gcc 7

Fixes the following warning from gcc7 by increasing the
buffer size to PATH_MAX.

semanage_store.c: In function ‘semanage_remove_directory’:
semanage_store.c:819:30: warning: ‘%s’ directive output may be truncated writing up to 255 bytes into a region of size 254 [-Wformat-truncation=]
   snprintf(s, sizeof(s), "%s/%s", path, namelist[i]->d_name);
                              ^~
semanage_store.c:819:3: note: ‘snprintf’ output 2 or more bytes (assuming 257) into a destination of size 255
   snprintf(s, sizeof(s), "%s/%s", path, namelist[i]->d_name);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Stephen Smalley <[email protected]>

libsemanage/src/semanage_store.c

@@ -814,7 +814,7 @@ int semanage_remove_directory(const char *path)
 		return -1;
 	}
 	for (i = 0; i < num_entries; i++) {
-		char s[NAME_MAX];
+		char s[PATH_MAX];
 		struct stat buf;
 		snprintf(s, sizeof(s), "%s/%s", path, namelist[i]->d_name);
 		if (stat(s, &buf) == -1) {