revert freeing of memory that gets allocated when str == NULL

(this will be fixed in a better way)

PR:		misc/26044

lib/libc/stdio/snprintf.c

@@ -87,7 +87,5 @@ snprintf(str, n, fmt, va_alist)
 	if (on > 0)
 		*f._p = '\0';
 	va_end(ap);
-	if (str == NULL)
-		free(f._bf._base);
 	return (ret);
 }

lib/libc/stdio/sprintf.c

@@ -77,7 +77,5 @@ sprintf(str, fmt, va_alist)
 	ret = __vfprintf(&f, fmt, ap);
 	va_end(ap);
 	*f._p = 0;
-	if (str == NULL)
-		free(f._bf._base);
 	return (ret);
 }

lib/libc/stdio/vsnprintf.c

@@ -69,7 +69,5 @@ vsnprintf(str, n, fmt, ap)
 	ret = __vfprintf(&f, fmt, ap);
 	if (on > 0)
 		*f._p = '\0';
-	if (str == NULL)
-		free(f._bf._base);
 	return (ret);
 }

lib/libc/stdio/vsprintf.c

@@ -61,7 +61,5 @@ vsprintf(str, fmt, ap)
 	f._bf._size = f._w = INT_MAX;
 	ret = __vfprintf(&f, fmt, ap);
 	*f._p = 0;
-	if (str == NULL)
-		free(f._bf._base);
 	return (ret);
 }