Fixed Bug #66987 Memory corruption in fileinfo ext (bigendian)

On little endian:
	map->p == php_magic_database
	map->magic[i] = pointer into the map

	map->p == NULL
	map->magic[i] = pointer to allocated memory

On big endian (ppc64, s390x, ...):
	map->p != php_magic_database and map->p != NULL
        map->magic[i] = pointer into a copy of the map

Trying to efree pointer in the later cause memory corruption
Thanks to dkatulek / Red Hat for the report.

ext/fileinfo/libmagic/apprentice.c

@@ -493,12 +493,14 @@ apprentice_unmap(struct magic_map *map)
 	if (map == NULL)
 		return;
 	if (map->p != php_magic_database) {
-		int j;
-		for (j = 0; j < MAGIC_SETS; j++) {
-			if (map->magic[j])
-				efree(map->magic[j]);
-		}
-		if (map->p != NULL) {
+		if (map->p == NULL) {
+			int j;
+			for (j = 0; j < MAGIC_SETS; j++) {
+				if (map->magic[j]) {
+					efree(map->magic[j]);
+				}
+			}
+		} else {
 			efree(map->p);
 		}
 	}