make regex_old.c, ruserpass.c use __uc_malloc,

replace "buf = malloc(BUFSIZ); if (!buf) abort();" by __uc_malloc
elsewhere.

With last 7 patches together uclibc has 3k of static data total
with fairly big .config and with 2k being used for 2 x BUFSIZ stdio buffer:
   text    data     bss     dec     hex filename
    114     132    2048    2294     8f6 _stdio.o (ex lib/libc.a)
total data 593
total bss  3062

1 files changed, 2 insertions, 3 deletions

diff --git a/libc/misc/mntent/mntent.c b/libc/misc/mntent/mntent.c
index a5db799dc..a9024be88 100644
--- a/libc/misc/mntent/mntent.c
+++ b/libc/misc/mntent/mntent.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <malloc.h>
 #include <mntent.h>
 #include <bits/uClibc_mutex.h>
 
@@ -84,9 +85,7 @@ struct mntent *getmntent(FILE * filep)
     __UCLIBC_MUTEX_LOCK(mylock);
     
     if (!buff) {
-            buff = malloc(BUFSIZ);
-		if (!buff)
-		    abort();
+            buff = __uc_malloc(BUFSIZ);
     }
     
     tmp = getmntent_r(filep, &mnt, buff, BUFSIZ);