tweaks: unwrap three lines that don't need to be wrapped

(These lines were noticed while checking that all
calls of nrealloc() use a size bigger than zero.)

src/browser.c

@@ -572,8 +572,7 @@ char *browse(char *path)
 
 			/* If the given path is relative, join it with the current path. */
 			if (*path != '/') {
-				path = nrealloc(path, strlen(present_path) +
+				path = nrealloc(path, strlen(present_path) + strlen(answer) + 1);
-												strlen(answer) + 1);
 				sprintf(path, "%s%s", present_path, answer);
 			}
 

src/files.c

@@ -2547,9 +2547,7 @@ char **filename_completion(const char *morsel, size_t *num_matches)
 		if (strncmp(entry->d_name, filename, filenamelen) == 0 &&
 									strcmp(entry->d_name, ".") != 0 &&
 									strcmp(entry->d_name, "..") != 0) {
-			fullname = nrealloc(fullname, strlen(dirname) +
+			fullname = nrealloc(fullname, strlen(dirname) + strlen(entry->d_name) + 1);
-											strlen(entry->d_name) + 1);
-
 			sprintf(fullname, "%s%s", dirname, entry->d_name);
 
 #ifdef ENABLE_OPERATINGDIR

src/text.c

@@ -1588,8 +1588,7 @@ void concat_paragraph(linestruct *line, size_t count)
 			line->data[line_len] = '\0';
 		}
 
-		line->data = nrealloc(line->data,
+		line->data = nrealloc(line->data, line_len + next_line_len - next_lead_len + 1);
-								line_len + next_line_len - next_lead_len + 1);
 		strcat(line->data, next_line->data + next_lead_len);
 #ifndef NANO_TINY
 		line->has_anchor |= next_line->has_anchor;