sysprof: use NULL when n-items is 0

src/sysprof/sysprof-logs-section.c

@@ -80,6 +80,8 @@ static char *
 format_number (gpointer unused,
                guint    number)
 {
+  if (number == 0)
+    return NULL;
   return g_strdup_printf ("%'u", number);
 }
 

src/sysprof/sysprof-marks-section.c

@@ -38,6 +38,8 @@ static char *
 format_number (gpointer unused,
                guint    number)
 {
+  if (number == 0)
+    return NULL;
   return g_strdup_printf ("%'u", number);
 }
 

src/sysprof/sysprof-processes-section.c

@@ -42,6 +42,8 @@ static char *
 format_number (gpointer unused,
                guint    number)
 {
+  if (number == 0)
+    return NULL;
   return g_strdup_printf ("%'u", number);
 }
 

src/sysprof/sysprof-samples-section.c

@@ -40,6 +40,8 @@ static char *
 format_number (gpointer unused,
                guint    number)
 {
+  if (number == 0)
+    return NULL;
   return g_strdup_printf ("%'u", number);
 }