Eliminate a few unbraced statements that crept into the code.

Also avoids some easily avoided multiple-returns.

src/bench.h

@@ -20,7 +20,9 @@ static double gettimedouble(void) {
 void print_number(double x) {
     double y = x;
     int c = 0;
-    if (y < 0.0) y = -y;
+    if (y < 0.0) {
+        y = -y;
+    }
     while (y < 100.0) {
         y *= 10.0;
         c++;
@@ -35,13 +37,21 @@ void run_benchmark(char *name, void (*benchmark)(void*), void (*setup)(void*), v
     double max = 0.0;
     for (i = 0; i < count; i++) {
         double begin, total;
-        if (setup) setup(data);
+        if (setup) {
+            setup(data);
+        }
         begin = gettimedouble();
         benchmark(data);
         total = gettimedouble() - begin;
-        if (teardown) teardown(data);
-        if (total < min) min = total;
-        if (total > max) max = total;
+        if (teardown) {
+            teardown(data);
+        }
+        if (total < min) {
+            min = total;
+        }
+        if (total > max) {
+            max = total;
+        }
         sum += total;
     }
     printf("%s: min ", name);