Revert "basic/allow-util: make free_many non-inline"

This reverts commit 3abe1e53f6.

I remain unconvinced. The function is very short, and
by making it inline the assert()s can be optimized away.

src/basic/alloc-util.c

@@ -164,10 +164,3 @@ void* greedy_realloc_append(
 
         return q;
 }
-
-void free_many(void **p, size_t n) {
-        assert(p || n == 0);
-
-        FOREACH_ARRAY(i, p, n)
-                *i = mfree(*i);
-}

src/basic/alloc-util.h

@@ -208,7 +208,12 @@ void* greedy_realloc_append(void **p, size_t *n_p, const void *from, size_t n_fr
 #endif
 
 /* Free every element of the array. */
-void free_many(void **p, size_t n);
+static inline void free_many(void **p, size_t n) {
+        assert(p || n == 0);
+
+        FOREACH_ARRAY(i, p, n)
+                *i = mfree(*i);
+}
 
 /* Typesafe wrapper for char** rather than void**. Unfortunately C won't implicitly cast this. */
 static inline void free_many_charp(char **c, size_t n) {