commit 56bfd58fdce4fc32a2be2981655252840c9c02cb
author Benjamin Drung <benjamin.drung@profitbricks.com> Wed Jun 13 11:48:39 2018 +0200
committer Ben Hutchings <ben@decadent.org.uk> Wed Jan 02 03:08:04 2019 +0000
tree dff8cef66a7067190f1e75e45f520b557b51e676
parent ee59de58cd3ebe9e98d19aeaadb39915b0b235fc

[klibc] mount_main: Fix empty string check

gcc 7.3.0 complains:

```
usr/utils/mount_main.c: In function ‘print_mount’:
usr/utils/mount_main.c:46:46: warning: comparison between pointer and zero character constant [-Wpointer-compare]
   if (mnt->mnt_type != NULL && mnt->mnt_type != '\0')
                                              ^~
usr/utils/mount_main.c:46:32: note: did you mean to dereference the pointer?
   if (mnt->mnt_type != NULL && mnt->mnt_type != '\0')
                                ^
usr/utils/mount_main.c:48:46: warning: comparison between pointer and zero character constant [-Wpointer-compare]
   if (mnt->mnt_opts != NULL && mnt->mnt_opts != '\0')
                                              ^~
usr/utils/mount_main.c:48:32: note: did you mean to dereference the pointer?
   if (mnt->mnt_opts != NULL && mnt->mnt_opts != '\0')
                                ^
```

Link: https://www.zytor.com/pipermail/klibc/2018-June/003994.html
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

usr/utils/mount_main.c

diff --git a/usr/utils/mount_main.c b/usr/utils/mount_main.c
index ab3cb71..0d299c4 100644
--- a/usr/utils/mount_main.c
+++ b/usr/utils/mount_main.c
@@ -43,9 +43,9 @@
 		if (type && mnt->mnt_type && strcmp(type, mnt->mnt_type))
 			continue;
 		printf("%s on %s", mnt->mnt_fsname, mnt->mnt_dir);
-		if (mnt->mnt_type != NULL && mnt->mnt_type != '\0')
+		if (mnt->mnt_type != NULL && *mnt->mnt_type != '\0')
 			printf(" type %s", mnt->mnt_type);
-		if (mnt->mnt_opts != NULL && mnt->mnt_opts != '\0')
+		if (mnt->mnt_opts != NULL && *mnt->mnt_opts != '\0')
 			printf(" (%s)", mnt->mnt_opts);
 		printf("\n");
 	}