Some codes replace to `RBOOL` macro (#5023)

* Some code replace and using RBOOL macro

* Fix indent

* Using RBOOL in syserr_eqq function

error.c

@@ -2421,9 +2421,7 @@ syserr_eqq(VALUE self, VALUE exc)
 	num = rb_funcallv(exc, id_errno, 0, 0);
     }
     e = rb_const_get(self, id_Errno);
-    if (FIXNUM_P(num) ? num == e : rb_equal(num, e))
-	return Qtrue;
-    return Qfalse;
+    return RBOOL(FIXNUM_P(num) ? num == e : rb_equal(num, e));
 }
 
 

process.c

@@ -898,10 +898,7 @@ pst_wifstopped(VALUE st)
 {
     int status = PST2INT(st);
 
-    if (WIFSTOPPED(status))
-	return Qtrue;
-    else
-	return Qfalse;
+    return RBOOL(WIFSTOPPED(status));
 }
 
 
@@ -937,10 +934,7 @@ pst_wifsignaled(VALUE st)
 {
     int status = PST2INT(st);
 
-    if (WIFSIGNALED(status))
-	return Qtrue;
-    else
-	return Qfalse;
+    return RBOOL(WIFSIGNALED(status));
 }
 
 
@@ -978,10 +972,7 @@ pst_wifexited(VALUE st)
 {
     int status = PST2INT(st);
 
-    if (WIFEXITED(status))
-	return Qtrue;
-    else
-	return Qfalse;
+    return RBOOL(WIFEXITED(status));
 }
 
 
@@ -1047,10 +1038,7 @@ pst_wcoredump(VALUE st)
 #ifdef WCOREDUMP
     int status = PST2INT(st);
 
-    if (WCOREDUMP(status))
-	return Qtrue;
-    else
-	return Qfalse;
+    return RBOOL(WCOREDUMP(status));
 #else
     return Qfalse;
 #endif

range.c

@@ -1792,14 +1792,12 @@ range_include_internal(VALUE range, VALUE val, int string_use_cover)
         else if (NIL_P(beg)) {
 	    VALUE r = rb_funcall(val, id_cmp, 1, end);
 	    if (NIL_P(r)) return Qfalse;
-	    if (rb_cmpint(r, val, end) <= 0) return Qtrue;
-	    return Qfalse;
+            return RBOOL(rb_cmpint(r, val, end) <= 0);
         }
 	else if (NIL_P(end)) {
 	    VALUE r = rb_funcall(beg, id_cmp, 1, val);
 	    if (NIL_P(r)) return Qfalse;
-	    if (rb_cmpint(r, beg, val) <= 0) return Qtrue;
-	    return Qfalse;
+            return RBOOL(rb_cmpint(r, beg, val) <= 0);
 	}
     }
     return Qundef;

thread.c

@@ -3326,12 +3326,7 @@ rb_thread_status(VALUE thread)
 static VALUE
 rb_thread_alive_p(VALUE thread)
 {
-    if (thread_finished(rb_thread_ptr(thread))) {
-        return Qfalse;
-    }
-    else {
-        return Qtrue;
-    }
+    return RBOOL(!thread_finished(rb_thread_ptr(thread)));
 }
 
 /*