tools:acrn-crashlog:fix potential issue

this patch fix potential issue of initialization
about local variable in fsutils.c

Tracked-On: #1024
Signed-off-by: Zhonghua <zhonghua.sun@intel.com>
Reviewed-by: Huang, Yonghua <yonghua.huang@intel.com>
Acked-by: Chen, Gang <gang.c.chen@intel.com>

tools/acrn-crashlog/common/fsutils.c

@@ -1014,7 +1014,7 @@ fail_open:
 
 int read_file(const char *path, unsigned long *size, void **data)
 {
-	char tmp[1024] = "\0";
+	char tmp[1024];
 	int len = 0;
 	int fd = 0;
 	int memsize = 1; /* for '\0' */