lavu/mem: un-inline av_size_mult()

There seems to be no compelling reason for it to be inline.

libavutil/mem.c

@@ -547,3 +547,21 @@ void av_fast_mallocz(void *ptr, unsigned int *size, size_t min_size)
 {
     fast_malloc(ptr, size, min_size, 1);
 }
+
+int av_size_mult(size_t a, size_t b, size_t *r)
+{
+    size_t t;
+
+#if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_mul_overflow)
+    if (__builtin_mul_overflow(a, b, &t))
+        return AVERROR(EINVAL);
+#else
+    t = a * b;
+    /* Hack inspired from glibc: don't try the division if nelem and elsize
+     * are both less than sqrt(SIZE_MAX). */
+    if ((a | b) >= ((size_t)1 << (sizeof(size_t) * 4)) && a && t / a != b)
+        return AVERROR(EINVAL);
+#endif
+    *r = t;
+    return 0;
+}

libavutil/mem.h

@@ -31,7 +31,6 @@
 #include <stdint.h>
 
 #include "attributes.h"
-#include "error.h"
 #include "avutil.h"
 #include "version.h"
 
@@ -672,23 +671,7 @@ void *av_dynarray2_add(void **tab_ptr, int *nb_ptr, size_t elem_size,
  * @param[out] r   Pointer to the result of the operation
  * @return 0 on success, AVERROR(EINVAL) on overflow
  */
-static inline int av_size_mult(size_t a, size_t b, size_t *r)
-{
-    size_t t;
-
-#if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_mul_overflow)
-    if (__builtin_mul_overflow(a, b, &t))
-        return AVERROR(EINVAL);
-#else
-    t = a * b;
-    /* Hack inspired from glibc: don't try the division if nelem and elsize
-     * are both less than sqrt(SIZE_MAX). */
-    if ((a | b) >= ((size_t)1 << (sizeof(size_t) * 4)) && a && t / a != b)
-        return AVERROR(EINVAL);
-#endif
-    *r = t;
-    return 0;
-}
+int av_size_mult(size_t a, size_t b, size_t *r);
 
 /**
  * Set the maximum size that may be allocated in one block.