lib: rstrcmp: Added null terminator check for comapring cstring of different lengths.

Signed-off-by: Michal Jerzy Wierzbicki <michalx.wierzbicki@linux.intel.com>

Author: mwierzbix

src/lib/lib.c

@@ -119,6 +119,12 @@ int rstrcmp(const char *s1, const char *s2)
 		s2++;
 	}
 
+	/* did both string end */
+	if (*s1 != 0)
+		return 1;
+	if (*s2 != 0)
+		return -1;
+
 	/* match */
 	return 0;
 }