x is past in as something like ("print %s", buf) that can not be compared

to NULL.

At least if you try the compiler gives this warning

warning: left-hand operand of comma expression has no effect [-Wunused-value]

In 13.12 this is treated as an error

contribs/pmi2/pmi2_util.h

@@ -30,11 +30,7 @@
 #if (1)
     #define PMI2U_printf(x...) do {				\
 	char logstr[1024];					\
-	if (NULL == x) {					\
-		snprintf(logstr, 1024, "N/A");			\
-	} else {						\
-		snprintf(logstr, 1024, x);			\
-	}							\
+	snprintf(logstr, 1024, x);      			\
 	fprintf(stderr, "[%s (%d): %s] %s\n",			\
 		__FILE__, __LINE__, __FUNCTION__, logstr);	\
     } while (0)