Fix compiler warning in smount example program from sharedsubtree.txt

If one compiles the example smount program, found in
Documentation/sharedsubtree.txt, with -Wall then there's a small
compiler warning rearing its ugly head :

 smount.c: In function 'main':
 smount.c:45: warning: implicit declaration of function 'strcmp'

Easily fixed by just including string.h

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/Documentation/sharedsubtree.txt b/Documentation/sharedsubtree.txt
index ccf1cebe744f..736540045dc7 100644
--- a/Documentation/sharedsubtree.txt
+++ b/Documentation/sharedsubtree.txt
@@ -153,6 +153,7 @@ replicas continue to be exactly same.
         #include <stdio.h>
         #include <stdlib.h>
         #include <unistd.h>
+        #include <string.h>
         #include <sys/mount.h>
         #include <sys/fsuid.h>