359331: modutil -changepw strict shutdown failure. r=nelson

security/nss/cmd/modutil/pk11.c

@@ -751,6 +751,8 @@ loser:
 	memset(newpw2, 0, strlen(newpw2));
 	PORT_Free(newpw2);
     }
+    PK11_FreeSlot(slot);
+
     return ret;
 }
 

security/nss/cmd/tests/remtest.c

@@ -157,6 +157,8 @@ int main(int argc, char **argv)
 	}
     } while (cont);
 
+    PK11_FreeSlot(slot);
+
     if (NSS_Shutdown() != SECSuccess) {
         exit(1);
     }