Avoid valgrind errors with getline.

src/librc/librc-misc.c

@@ -119,12 +119,13 @@ char *rc_getline (FILE *fp)
 		len += BUFSIZ;
 		line = xrealloc (line, sizeof (char) * len);
 		p = line + last;
+		memset (p, 0, BUFSIZ);
 		fgets (p, BUFSIZ, fp);
 		last += strlen (p);
 	} while (! feof (fp) && line[last - 1] != '\n');
 
 	/* Trim the trailing newline */
-	if (line[--last] == '\n')
+	if (*line && line[--last] == '\n')
 		line[last] = '\0';
 
 	return (line);