[libclc] Clarify condition expression (NFC)

Closes #91188

Author: JOE1994

libclc/generic/lib/math/log_base.h

@@ -209,7 +209,7 @@ log(double x)
     const double log_thresh1 = 0x1.e0faap-1;
     const double log_thresh2 = 0x1.1082cp+0;
 
-    int is_near = x >= log_thresh1 & x <= log_thresh2;
+    bool is_near = x >= log_thresh1 && x <= log_thresh2;
 
     // Near 1 code
     double r = x - 1.0;