Avoid leaking pathbuf when path==0 by marking allocation failures as fatal.
SPDX-License-Identifier: CC0-1.0
--- a/lemon.c
+++ b/lemon.c
@@ -3538,6 +3548,7 @@ PRIVATE char *pathsearch(char *argv0, char *name, int modemask)
     if( pathlist==0 ) pathlist = ".:/bin:/usr/bin";
     pathbuf = (char *) malloc( lemonStrlen(pathlist) + 1 );
     path = (char *)malloc( lemonStrlen(pathlist)+lemonStrlen(name)+2 );
+    MemoryCheck(pathbuf); MemoryCheck(path);  /* Fail on allocation failure. */
     if( (pathbuf != 0) && (path!=0) ){
       pathbufptr = pathbuf;
       lemon_strcpy(pathbuf, pathlist);