Fix a few warnings pointed out via clang scan-build

Some of these are legit (the backup hash NULL checks), while others are
either extemely unlikely or just impossible for the static code
analysis to prove, but are worth adding anyway because they have little
overhead.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/libalpm/backup.c b/lib/libalpm/backup.c
index 0334042c..becc7be9 100644
--- a/lib/libalpm/backup.c
+++ b/lib/libalpm/backup.c
@@ -40,7 +40,7 @@ int _alpm_split_backup(const char *string, alpm_backup_t **backup)
 	STRDUP(str, string, return -1);
 
 	/* tab delimiter */
-	ptr = strchr(str, '\t');
+	ptr = str ? strchr(str, '\t') : NULL;
 	if(ptr == NULL) {
 		(*backup)->name = str;
 		(*backup)->hash = NULL;