Remove st != NULL checks from recursor functions

In the description of 3111908b03, it says
that the functions must be able to handle st being NULL, but recurse
always passes a valid pointer. The only function that was ever passed
NULL was rm(), but this was changed to go through recurse in
2f4ab52739, so now the checks are
pointless.

chgrp.c

@@ -26,10 +26,10 @@ chgrp(const char *path, struct stat *st, void *data, struct recursor *r)
 		chownf = chown;
 	}
 
-	if (st && chownf(path, st->st_uid, gid) < 0) {
+	if (chownf(path, st->st_uid, gid) < 0) {
 		weprintf("%s %s:", chownf_name, path);
 		ret = 1;
-	} else if (st && S_ISDIR(st->st_mode)) {
+	} else if (S_ISDIR(st->st_mode)) {
 		recurse(path, NULL, r);
 	}
 }

chmod.c

@@ -13,11 +13,11 @@ chmodr(const char *path, struct stat *st, void *data, struct recursor *r)
 {
 	mode_t m;
 
-	m = parsemode(modestr, st ? st->st_mode : 0, mask);
+	m = parsemode(modestr, st->st_mode, mask);
 	if (chmod(path, m) < 0) {
 		weprintf("chmod %s:", path);
 		ret = 1;
-	} else if (st && S_ISDIR(st->st_mode)) {
+	} else if (S_ISDIR(st->st_mode)) {
 		recurse(path, NULL, r);
 	}
 }

chown.c

@@ -32,7 +32,7 @@ chownpwgr(const char *path, struct stat *st, void *data, struct recursor *r)
 	if (chownf(path, uid, gid) < 0) {
 		weprintf("%s %s:", chownf_name, path);
 		ret = 1;
-	} else if (st && S_ISDIR(st->st_mode)) {
+	} else if (S_ISDIR(st->st_mode)) {
 		recurse(path, NULL, r);
 	}
 }

du.c

@@ -39,11 +39,11 @@ du(const char *path, struct stat *st, void *total, struct recursor *r)
 {
 	off_t subtotal = 0;
 
-	if (st && S_ISDIR(st->st_mode))
+	if (S_ISDIR(st->st_mode))
 		recurse(path, &subtotal, r);
-	*((off_t *)total) += subtotal + nblks(st ? st->st_blocks : 0);
+	*((off_t *)total) += subtotal + nblks(st->st_blocks);
 
-	if (!sflag && r->depth <= maxdepth && r->depth && st && (S_ISDIR(st->st_mode) || aflag))
+	if (!sflag && r->depth <= maxdepth && r->depth && (S_ISDIR(st->st_mode) || aflag))
 		printpath(subtotal + nblks(st->st_blocks), path);
 }
 

libutil/rm.c

@@ -13,7 +13,7 @@ int rm_status = 0;
 void
 rm(const char *path, struct stat *st, void *data, struct recursor *r)
 {
-	if (!r->maxdepth && st && S_ISDIR(st->st_mode)) {
+	if (!r->maxdepth && S_ISDIR(st->st_mode)) {
 		recurse(path, NULL, r);
 
 		if (rmdir(path) < 0) {

tar.c

@@ -370,7 +370,7 @@ c(const char *path, struct stat *st, void *data, struct recursor *r)
 	if (vflag)
 		puts(path);
 
-	if (st && S_ISDIR(st->st_mode))
+	if (S_ISDIR(st->st_mode))
 		recurse(path, NULL, r);
 }