[modesetting] Fix memory leak in modesetting_report_mass_storage_bloc…

…ker()

Line buffer allocated/managed by getline() is not released.

Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

src/usb_moded-modesetting.c

@@ -491,6 +491,7 @@ static void modesetting_report_mass_storage_blocker(const char *mountpoint, int
             count++;
         }
         pclose(stream);
+        free(text);
     }
     g_free(lsof_command);
     if(try == 2)