Change all references from avsprintf to vasprintf. From Sebastien Lorquet

libc/stdio/Make.defs

@@ -38,7 +38,7 @@
 # C streams.
 
 CSRCS += lib_fileno.c lib_printf.c lib_sprintf.c lib_asprintf.c
-CSRCS += lib_snprintf.c lib_libsprintf.c lib_vsprintf.c lib_avsprintf.c
+CSRCS += lib_snprintf.c lib_libsprintf.c lib_vsprintf.c lib_vasprintf.c
 CSRCS += lib_vsnprintf.c lib_libvsprintf.c lib_dprintf.c lib_vdprintf.c
 CSRCS += lib_meminstream.c lib_memoutstream.c lib_memsistream.c
 CSRCS += lib_memsostream.c lib_lowinstream.c lib_lowoutstream.c

libc/stdio/lib_asprintf.c

@@ -97,10 +97,10 @@ int asprintf (FAR char **ptr, const char *fmt, ...)
   va_list ap;
   int ret;
 
-  /* Let avsprintf do all of the work */
+  /* Let vasprintf do all of the work */
 
   va_start(ap, fmt);
-  ret = avsprintf(ptr, fmt, ap);
+  ret = vasprintf(ptr, fmt, ap);
   va_end(ap);
 
   return ret;

libc/stdio/lib_avsprintf.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/stdio/lib_avsprintf.c
+ * libc/stdio/lib_vasprintf.c
  *
  *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
@@ -49,7 +49,7 @@
  ****************************************************************************/
 /* On some architectures, va_list is really a pointer to a structure on the
  * stack.  And the va_arg builtin will modify that instance of va_list.  Since
- * avsprintf traverse the parameters in the va_list twice, the va_list will
+ * vasprintf traverse the parameters in the va_list twice, the va_list will
  * be altered in this first cases and the second usage will fail.  So far, I
  * have seen this only on the X86 family with GCC.
  */
@@ -95,14 +95,14 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Name: avsprintf
+ * Name: vasprintf
  *
  * Description:
  *   This function is similar to vsprintf, except that it dynamically
  *   allocates a string (as with malloc) to hold the output, instead of
  *   putting the output in a buffer you allocate in advance.  The ptr
  *   argument should be the address of a char * object, and a successful
- *   call to avsprintf stores a pointer to the newly allocated string at that
+ *   call to vasprintf stores a pointer to the newly allocated string at that
  *   location.
  *
  * Returned Value:
@@ -112,7 +112,7 @@
  *
  ****************************************************************************/
 
-int avsprintf(FAR char **ptr, const char *fmt, va_list ap)
+int vasprintf(FAR char **ptr, const char *fmt, va_list ap)
 {
   struct lib_outstream_s nulloutstream;
   struct lib_memoutstream_s memoutstream;