xgetXXbyYY: Avoid duplicated error handling block

The error handling is performed after the loop. By just calling break it
is possible to reuse the error handling if status is not ERANGE.

Signed-off-by: Samanta Navarro <ferivoz@riseup.net>

libmisc/xgetXXbyYY.c

@@ -81,9 +81,7 @@
 		}
 
 		if (ERANGE != status) {
-			free (buffer);
-			free (result);
-			return NULL;
+			break;
 		}
 
 		if (length <= ((size_t)-1 / 4)) {