Change internal interface to not copy string.

* The only user immediately destroyd the copy.

src/input_file.c

@@ -119,9 +119,9 @@ int cdiInputFile_read(const CdiInputFile* me, off_t readPosition, size_t readSiz
   return CDI_NOERR;
 }
 
-char* cdiInputFile_copyPath(const CdiInputFile* me)
+const char* cdiInputFile_getPath(const CdiInputFile* me)
 {
-  return myStrDup(me->path);
+  return me->path;
 }
 
 void cdiInputFile_destruct(CdiInputFile* me)

src/input_file.h

@@ -21,7 +21,9 @@ typedef struct CdiInputFile {
 //Final class, the constructor is private and not defined here.
 CdiInputFile* cdiInputFile_make(const char* path);   //The caller is responsible to call cdiRefObject_release() on the returned object.
 int cdiInputFile_read(const CdiInputFile* me, off_t readPosition, size_t readSize, size_t* outActualReadSize, void* buffer);       //Returns one of CDI_EINVAL, CDI_ESYSTEM, CDI_EEOF, OR CDI_NOERR.
-char* cdiInputFile_copyPath(const CdiInputFile* me);    //Returns a malloc'ed string, don't forget to free() it.
+/* Returns path string, don't use after destruction of CdiInputFile
+ * object */
+const char* cdiInputFile_getPath(const CdiInputFile* me);
 //Destructor is private as well.
 
 #endif

src/iterator_grib.c

@@ -120,9 +120,8 @@ char* cdiGribIterator_serialize(CdiIterator* super)
 {
   CdiGribIterator* me = (CdiGribIterator*)super;
 
-  char* path = cdiInputFile_copyPath(me->file);
+  const char* path = cdiInputFile_getPath(me->file);
   char* escapedPath = cdiEscapeSpaces(path);
-  free(path);
   char* result = myAsprintf("%s %zu", escapedPath, me->fileOffset);
   free(escapedPath);
   return result;