Fix conversions between char and int

Author: mortie

linenoise.c

@@ -931,6 +931,7 @@ char *linenoiseEditFeed(struct linenoiseState *l) {
 
     char c;
     int nread;
+    int ret;
     char seq[3];
 
     nread = read(l->ifd,&c,1);
@@ -940,11 +941,12 @@ char *linenoiseEditFeed(struct linenoiseState *l) {
      * there was an error reading from fd. Otherwise it will return the
      * character that should be handled next. */
     if ((l->in_completion || c == 9) && completionCallback != NULL) {
-        c = completeLine(l,c);
+        ret = completeLine(l,(unsigned char)c);
         /* Return on errors */
-        if (c < 0) return NULL;
+        if (ret < 0) return NULL;
         /* Read next character when 0 */
-        if (c == 0) return linenoiseEditMore;
+        if (ret == 0) return linenoiseEditMore;
+        c = (char)ret;
     }
 
     switch(c) {