Fix Wextra warning

mpiuse.c

@@ -155,7 +155,7 @@ void mpiuse_log_restore(const char *filename) {
 
   while (!feof(fd)) {
     if (fgets(line, 132, fd) != NULL) {
-      if (line[0] != '#') {
+      if (line[0] != '#' && line[0] != '\n') {
         sscanf(line, "%zd %zd %zd %d %d %d %s %d %s %d %d %d %zd %zd", &stic,
                &etic, &dtic, &step, &rank, &otherrank, type, &itype, subtype,
                &isubtype, &activation, &tag, &size, &sum);
@@ -254,6 +254,6 @@ int mpiuse_nr_ranks(void) { return mpiuse_max_rank + 1; }
  */
 struct mpiuse_log_entry *mpiuse_get_log(int ind) {
 
-  if (ind < mpiuse_log_count && ind >= 0) return &mpiuse_log[ind];
+  if (ind < (int)mpiuse_log_count && ind >= 0) return &mpiuse_log[ind];
   return NULL;
 }