delete unused function in column.c

[Rob Pierce]

I stumbled across this while studying calloc() calls in the tree.

ok?

Index: column.c
===================================================================
RCS file: /cvs/src/usr.bin/column/column.c,v
retrieving revision 1.25
diff -u -p -r1.25 column.c
--- column.c    4 Sep 2016 20:33:36 -0000       1.25
+++ column.c    22 Jun 2018 02:34:24 -0000
@@ -46,7 +46,6 @@
 
 void  c_columnate(void);
 void *ereallocarray(void *, size_t, size_t);
-void *ecalloc(size_t, size_t);
 void  input(FILE *);
 void  maketbl(void);
 void  print(void);
@@ -339,16 +338,6 @@ void *
 ereallocarray(void *ptr, size_t nmemb, size_t size)
 {
        if ((ptr = reallocarray(ptr, nmemb, size)) == NULL)
-               err(1, NULL);
-       return ptr;
-}
-
-void *
-ecalloc(size_t nmemb, size_t size)
-{
-       void *ptr;
-
-       if ((ptr = calloc(nmemb, size)) == NULL)
                err(1, NULL);
        return ptr;
 }