tweaks: fix several whitespace irregularities

Add missing spaces, remove excess spaces, and
replace groups of indentation spaces with tabs.

src/utils.c

@@ -77,8 +77,7 @@ int digits(ssize_t n)
 		return 6;
 	    else
 		return 7;
-        }
-        else {
+	} else {
 	    if (n < 100000000)
 		return 8;
 	    else