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Change assertion condition in __FILE__ buf dumping

Removes a false positive from Clang static analysis

--- a/src/asm/symbol.c

+++ b/src/asm/symbol.c

@@ -103,7 +103,7 @@

 	size_t j = 1;

 	/* TODO: is there a way for a file name to be empty? */

-	assert(strlen(fileName) != 0);

+	assert(fileName[0]);

 	/* The assertion above ensures the loop runs at least once */

 	for (size_t i = 0; fileName[i]; i++, j++) {

 		/* Account for the extra backslash inserted below */