Fix memory leak in configure, which prevents leak sanitizer usage

Signed-off-by: Christoph Niethammer <[email protected]>

Author: cniethammer

config/c_get_alignment.m4

@@ -45,6 +45,7 @@ AC_DEFUN([OPAL_C_GET_ALIGNMENT],[
     if (!f) exit(1);
     diff = ((char *)&p->x) - ((char *)&p->c);
     fprintf(f, "%d\n", (diff >= 0) ? diff : -diff);
+    free(p);
 ]])],                         [AS_TR_SH([opal_cv_c_align_$1])=`cat conftestval`],
                                [AC_MSG_WARN([*** Problem running configure test!])
                                 AC_MSG_WARN([*** See config.log for details.])