Remove some redundant parenthesis; no functional change.

src/lib/gen/io.c

@@ -405,19 +405,19 @@ io_noblocking(struct iop *iop, int value)
 int
 io_conn(struct iop *iop)
 {
-    return (iop->flags & IO_CONN);
+    return iop->flags & IO_CONN;
 }
 
 int
 io_error(struct iop *iop)
 {
-    return (iop->flags & IO_ERROR);
+    return iop->flags & IO_ERROR;
 }
 
 int
 io_eof(struct iop *iop)
 {
-    return (iop->flags & IO_EOF);
+    return iop->flags & IO_EOF;
 }
 
 int

src/lib/gen/plur.c

@@ -37,23 +37,23 @@
 s_char *
 plur(int n, s_char *no, s_char *yes)
 {
-    return (n == 1 ? no : yes);
+    return n == 1 ? no : yes;
 }
 
 s_char *
 splur(int n)
 {
-    return (n == 1 ? "" : "s");
+    return n == 1 ? "" : "s";
 }
 
 s_char *
 esplur(int n)
 {
-    return (n == 1 ? "" : "es");
+    return n == 1 ? "" : "es";
 }
 
 s_char *
 iesplur(int n)
 {
-    return (n == 1 ? "y" : "ies");
+    return n == 1 ? "y" : "ies";
 }

src/lib/gen/round.c

@@ -39,7 +39,7 @@ roundintby(int n, int m)
     register int r11;
 
     r11 = (m >> 1) + n;
-    return (r11 / m * m);
+    return r11 / m * m;
 }
 
 int
@@ -48,5 +48,5 @@ ldround(double a4, int ac)
     int f4;
 
     f4 = ac / 2.0 + a4;
-    return (f4 / ac * ac);
+    return f4 / ac * ac;
 }

src/lib/gen/scthash.c

@@ -40,5 +40,5 @@ scthash(int x, int y, int tsize)
 	x = -x;
     if (y < 0)
 	y = -y;
-    return ((x * 10 + y) % tsize);
+    return (x * 10 + y) % tsize;
 }