autofs: partial is also leaked.

partial is also always leaked (since we reallocate it each time through
the loop). It should be freed before we return as well.

Noticed by: kib
Sponsored by:		Netflix

usr.sbin/autofs/common.c

@@ -153,6 +153,7 @@ create_directory(const char *path)
 		}
 	}
 
+	free(partial);
 	free(tofree);
 }